Difference: Nov2007 (1 vs. 11)

Revision 112014-07-22 - GunmoRyu

Changed:
<
<
META TOPICPARENT name="Tier2.SangUnAhnsLog"
>
>
META TOPICPARENT name="OldWebs.OldWebs.DAQ.SangUnAhnsLog"
 

November 2007

Daily Log

At first I started off by calculating the missing transverse energy corresponding to lepton neutrino. It is easy to get the MET through some modules, but to calculate total missing energy is not easy rather hard-working. Therefore I have chosen the fully hadronic channel because it is more instructive at the moment. After finishing fully hadronic channel, the analysis of the semi-leptonic channel will be performed. I suppose the study of fully hadronic channel could be helpful to analyze the semi-leptonic channel because it has not only leptonic channel but also half hadronic channel. Jeewon also has started studying fully hadronic channel. However we are following slightly different ways. I focused on the event selection cuts and she centred on QCD background. 13.11.2007

Fully hadronic channel

  • Some features :
    • Large QCD backgrounds
    • Need not to take into account the missing energy (neutrinos)
    • Largiest branching ratio ~ 46%
    • Two leading jets are considered as b-jets
      • b-tagging are not performed in this analysis but it will be taken into account later

Framework and samples

Preliminary

Jet efficiency
  • Tried to make efficiency plots by varying the number of jets in events
  • Tried to see the effect to the efficiency by adjusting the parameters corresponding to jest in analysis.cfg
    • Event rejection decision : rej_BadHardJet = TRUE ro FALSE
    • Primary and final accpetance pt cut, 20 GeV and 30 GeV, respectively
    • Also eta cuts for primary and final acceptance : Max = 5
    • Extrapolation error adjustment(in cm) :
      • reco_jetD0ErrorThresh = 0.05
      • reco_jetDzErrorThresh = 0.10
      • reco_bjetD0ErrorThresh = 0.5
      • reco_bjetDzErrorThresh = 0.20
  • 4jets event for example
    • Rejection Bad Hard jet = True
      • jetD0 and DzErrorThresh : jetD0ErrorThresh = 0 & jetDzErrorThresh = 0 ( bjet cases are non-zero )
      • para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif
      • bjetD0 and DzErrorThresh : bjetD0ErrorThresh = 0 & bjetDzErrorThresh = 0
      • para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif
    • Rejection Bad Hard jet = false
      • Extrapolation error adjustment are all zero
      • para_check_rej_BadHadJetfalse.gif
      • Extrapolation error adjustment are non-zero
      • para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif
  • Simple conclusion :
    • Efficiency increased when the extrapolation error adjustment implemented, especially non-bjet cuts
    • Rejection bad hard jet cuts can decrease the efficiency slightly

Event selection

Sum of non-leading jests
  • Non-leading jet total transverse energy obtained removing the two most energetic jets
  • Sum_3 >= 148 GeV
  • ttnj_sumet3_take2.gif
Verifying jet-parton-matching
  • The six partons in fully hadronic channel are matched to six reconstruced jets by picking the matching which minimises the sum of the angular seperation between reconstructed jet and matched parton. CMS Notes
    • good jet-parton-matching : Each of the six partons and jets differ only by 15(deg) and the jet-reconstructed tops also differ only by 15(deg) from their corresponding parton-level direction.
    • half-good jet-parton-matching : Three of the partons and jets forming one top differ only by 15(deg) and this jet-reconstructed top also differ only by 15(deg) from his corresponding parton-level direction.
    • bad jet-parton-matching : Everthing else.
  • SusyAnalyzer has own MatchObject class, so I tried to verify how it is efficient by using this method.
  • As results, the value of 15(deg) is somewhat arbitrary but all matching objects are good.
  • i.e. total six jets and partons, so 6 * 15 = 90(deg). the distribution for good jet-parton-mathing shows well below 90(deg)

jpm_good.gif

  • half-good jet-parton-mathing will be performed after correct top signal obtained
The other event selection cuts
Centrality
  • Centrality C >= 0.68
    • the fraction of the hard scatter energy going in the transverse plane.
    • centrality_ttnj.gif
Aplanarity

Jet-pairing

Plan to do
average of the W candidates' masses
ttnj_jjmean.gif
difference of the W candidates' masses
ttnj_jjdiff.gif
sum of the W candidates' jet-angles
difference of the top-candidates' masses
sum of the top-candidates' jet-angles
angle between the top-candidates

-- SangUnAhn - 13 Nov 2007

META FILEATTACHMENT attachment="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" attr="" comment="" date="1195039286" name="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" path="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" size="7275" stream="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" attr="" comment="" date="1195039294" name="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" path="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" size="7178" stream="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_rej_BadHadJetfalse.gif" attr="" comment="" date="1195040476" name="para_check_rej_BadHadJetfalse.gif" path="para_check_rej_BadHadJetfalse.gif" size="7207" stream="para_check_rej_BadHadJetfalse.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" attr="" comment="" date="1195040501" name="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" path="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" size="7234" stream="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="jpm_good.gif" attr="" comment="" date="1195043980" name="jpm_good.gif" path="jpm_good.gif" size="6957" stream="jpm_good.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="aplanarity_ttnj.gif" attr="" comment="" date="1195051186" name="aplanarity_ttnj.gif" path="aplanarity_ttnj.gif" size="5398" stream="aplanarity_ttnj.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="centrality_ttnj.gif" attr="" comment="" date="1195051195" name="centrality_ttnj.gif" path="centrality_ttnj.gif" size="8467" stream="centrality_ttnj.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_sumet3_take2.gif" attr="" comment="" date="1195051897" name="ttnj_sumet3_take2.gif" path="ttnj_sumet3_take2.gif" size="7818" stream="ttnj_sumet3_take2.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_jjmean.gif" attr="" comment="" date="1195052007" name="ttnj_jjmean.gif" path="ttnj_jjmean.gif" size="9522" stream="ttnj_jjmean.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_jjdiff.gif" attr="" comment="" date="1195052017" name="ttnj_jjdiff.gif" path="ttnj_jjdiff.gif" size="9600" stream="ttnj_jjdiff.gif" user="Main.SangUnAhn" version="1"

Revision 102011-12-22 - GunmoRyu

Changed:
<
<
META TOPICPARENT name="SangUnAhnsLog"
>
>
META TOPICPARENT name="Tier2.SangUnAhnsLog"
 

November 2007

Daily Log

At first I started off by calculating the missing transverse energy corresponding to lepton neutrino. It is easy to get the MET through some modules, but to calculate total missing energy is not easy rather hard-working. Therefore I have chosen the fully hadronic channel because it is more instructive at the moment. After finishing fully hadronic channel, the analysis of the semi-leptonic channel will be performed. I suppose the study of fully hadronic channel could be helpful to analyze the semi-leptonic channel because it has not only leptonic channel but also half hadronic channel. Jeewon also has started studying fully hadronic channel. However we are following slightly different ways. I focused on the event selection cuts and she centred on QCD background. 13.11.2007

Fully hadronic channel

  • Some features :
    • Large QCD backgrounds
    • Need not to take into account the missing energy (neutrinos)
    • Largiest branching ratio ~ 46%
    • Two leading jets are considered as b-jets
      • b-tagging are not performed in this analysis but it will be taken into account later

Framework and samples

Preliminary

Jet efficiency
  • Tried to make efficiency plots by varying the number of jets in events
  • Tried to see the effect to the efficiency by adjusting the parameters corresponding to jest in analysis.cfg
    • Event rejection decision : rej_BadHardJet = TRUE ro FALSE
    • Primary and final accpetance pt cut, 20 GeV and 30 GeV, respectively
    • Also eta cuts for primary and final acceptance : Max = 5
    • Extrapolation error adjustment(in cm) :
      • reco_jetD0ErrorThresh = 0.05
      • reco_jetDzErrorThresh = 0.10
      • reco_bjetD0ErrorThresh = 0.5
      • reco_bjetDzErrorThresh = 0.20
  • 4jets event for example
    • Rejection Bad Hard jet = True
      • jetD0 and DzErrorThresh : jetD0ErrorThresh = 0 & jetDzErrorThresh = 0 ( bjet cases are non-zero )
      • para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif
      • bjetD0 and DzErrorThresh : bjetD0ErrorThresh = 0 & bjetDzErrorThresh = 0
      • para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif
    • Rejection Bad Hard jet = false
      • Extrapolation error adjustment are all zero
      • para_check_rej_BadHadJetfalse.gif
      • Extrapolation error adjustment are non-zero
      • para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif
  • Simple conclusion :
    • Efficiency increased when the extrapolation error adjustment implemented, especially non-bjet cuts
    • Rejection bad hard jet cuts can decrease the efficiency slightly

Event selection

Sum of non-leading jests
  • Non-leading jet total transverse energy obtained removing the two most energetic jets
  • Sum_3 >= 148 GeV
  • ttnj_sumet3_take2.gif
Verifying jet-parton-matching
  • The six partons in fully hadronic channel are matched to six reconstruced jets by picking the matching which minimises the sum of the angular seperation between reconstructed jet and matched parton. CMS Notes
    • good jet-parton-matching : Each of the six partons and jets differ only by 15(deg) and the jet-reconstructed tops also differ only by 15(deg) from their corresponding parton-level direction.
    • half-good jet-parton-matching : Three of the partons and jets forming one top differ only by 15(deg) and this jet-reconstructed top also differ only by 15(deg) from his corresponding parton-level direction.
    • bad jet-parton-matching : Everthing else.
  • SusyAnalyzer has own MatchObject class, so I tried to verify how it is efficient by using this method.
  • As results, the value of 15(deg) is somewhat arbitrary but all matching objects are good.
  • i.e. total six jets and partons, so 6 * 15 = 90(deg). the distribution for good jet-parton-mathing shows well below 90(deg)

jpm_good.gif

  • half-good jet-parton-mathing will be performed after correct top signal obtained
The other event selection cuts
Centrality
  • Centrality C >= 0.68
    • the fraction of the hard scatter energy going in the transverse plane.
    • centrality_ttnj.gif
Aplanarity

Jet-pairing

Plan to do
average of the W candidates' masses
ttnj_jjmean.gif
difference of the W candidates' masses
ttnj_jjdiff.gif
sum of the W candidates' jet-angles
difference of the top-candidates' masses
sum of the top-candidates' jet-angles
angle between the top-candidates

-- SangUnAhn - 13 Nov 2007

META FILEATTACHMENT attachment="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" attr="" comment="" date="1195039286" name="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" path="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" size="7275" stream="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" attr="" comment="" date="1195039294" name="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" path="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" size="7178" stream="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_rej_BadHadJetfalse.gif" attr="" comment="" date="1195040476" name="para_check_rej_BadHadJetfalse.gif" path="para_check_rej_BadHadJetfalse.gif" size="7207" stream="para_check_rej_BadHadJetfalse.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" attr="" comment="" date="1195040501" name="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" path="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" size="7234" stream="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="jpm_good.gif" attr="" comment="" date="1195043980" name="jpm_good.gif" path="jpm_good.gif" size="6957" stream="jpm_good.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="aplanarity_ttnj.gif" attr="" comment="" date="1195051186" name="aplanarity_ttnj.gif" path="aplanarity_ttnj.gif" size="5398" stream="aplanarity_ttnj.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="centrality_ttnj.gif" attr="" comment="" date="1195051195" name="centrality_ttnj.gif" path="centrality_ttnj.gif" size="8467" stream="centrality_ttnj.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_sumet3_take2.gif" attr="" comment="" date="1195051897" name="ttnj_sumet3_take2.gif" path="ttnj_sumet3_take2.gif" size="7818" stream="ttnj_sumet3_take2.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_jjmean.gif" attr="" comment="" date="1195052007" name="ttnj_jjmean.gif" path="ttnj_jjmean.gif" size="9522" stream="ttnj_jjmean.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_jjdiff.gif" attr="" comment="" date="1195052017" name="ttnj_jjdiff.gif" path="ttnj_jjdiff.gif" size="9600" stream="ttnj_jjdiff.gif" user="Main.SangUnAhn" version="1"

Revision 92008-01-30 - SangUnAhn

 
META TOPICPARENT name="SangUnAhnsLog"

November 2007

Changed:
<
<
>
>
Added:
>
>

Daily Log

  At first I started off by calculating the missing transverse energy corresponding to lepton neutrino. It is easy to get the MET through some modules, but to calculate total missing energy is not easy rather hard-working. Therefore I have chosen the fully hadronic channel because it is more instructive at the moment. After finishing fully hadronic channel, the analysis of the semi-leptonic channel will be performed. I suppose the study of fully hadronic channel could be helpful to analyze the semi-leptonic channel because it has not only leptonic channel but also half hadronic channel. Jeewon also has started studying fully hadronic channel. However we are following slightly different ways. I focused on the event selection cuts and she centred on QCD background. 13.11.2007

Fully hadronic channel

  • Some features :
    • Large QCD backgrounds
    • Need not to take into account the missing energy (neutrinos)
    • Largiest branching ratio ~ 46%
    • Two leading jets are considered as b-jets
      • b-tagging are not performed in this analysis but it will be taken into account later

Framework and samples

Preliminary

Jet efficiency
  • Tried to make efficiency plots by varying the number of jets in events
  • Tried to see the effect to the efficiency by adjusting the parameters corresponding to jest in analysis.cfg
    • Event rejection decision : rej_BadHardJet = TRUE ro FALSE
    • Primary and final accpetance pt cut, 20 GeV and 30 GeV, respectively
    • Also eta cuts for primary and final acceptance : Max = 5
    • Extrapolation error adjustment(in cm) :
      • reco_jetD0ErrorThresh = 0.05
      • reco_jetDzErrorThresh = 0.10
      • reco_bjetD0ErrorThresh = 0.5
      • reco_bjetDzErrorThresh = 0.20
  • 4jets event for example
    • Rejection Bad Hard jet = True
      • jetD0 and DzErrorThresh : jetD0ErrorThresh = 0 & jetDzErrorThresh = 0 ( bjet cases are non-zero )
      • para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif
      • bjetD0 and DzErrorThresh : bjetD0ErrorThresh = 0 & bjetDzErrorThresh = 0
      • para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif
    • Rejection Bad Hard jet = false
      • Extrapolation error adjustment are all zero
      • para_check_rej_BadHadJetfalse.gif
      • Extrapolation error adjustment are non-zero
      • para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif
  • Simple conclusion :
    • Efficiency increased when the extrapolation error adjustment implemented, especially non-bjet cuts
    • Rejection bad hard jet cuts can decrease the efficiency slightly

Event selection

Sum of non-leading jests
  • Non-leading jet total transverse energy obtained removing the two most energetic jets
  • Sum_3 >= 148 GeV
  • ttnj_sumet3_take2.gif
Verifying jet-parton-matching
  • The six partons in fully hadronic channel are matched to six reconstruced jets by picking the matching which minimises the sum of the angular seperation between reconstructed jet and matched parton. CMS Notes
    • good jet-parton-matching : Each of the six partons and jets differ only by 15(deg) and the jet-reconstructed tops also differ only by 15(deg) from their corresponding parton-level direction.
    • half-good jet-parton-matching : Three of the partons and jets forming one top differ only by 15(deg) and this jet-reconstructed top also differ only by 15(deg) from his corresponding parton-level direction.
    • bad jet-parton-matching : Everthing else.
  • SusyAnalyzer has own MatchObject class, so I tried to verify how it is efficient by using this method.
  • As results, the value of 15(deg) is somewhat arbitrary but all matching objects are good.
  • i.e. total six jets and partons, so 6 * 15 = 90(deg). the distribution for good jet-parton-mathing shows well below 90(deg)

jpm_good.gif

  • half-good jet-parton-mathing will be performed after correct top signal obtained
The other event selection cuts
Centrality
  • Centrality C >= 0.68
    • the fraction of the hard scatter energy going in the transverse plane.
    • centrality_ttnj.gif
Aplanarity

Jet-pairing

Plan to do
average of the W candidates' masses
ttnj_jjmean.gif
difference of the W candidates' masses
ttnj_jjdiff.gif
sum of the W candidates' jet-angles
difference of the top-candidates' masses
sum of the top-candidates' jet-angles
angle between the top-candidates

-- SangUnAhn - 13 Nov 2007

META FILEATTACHMENT attachment="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" attr="" comment="" date="1195039286" name="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" path="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" size="7275" stream="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" attr="" comment="" date="1195039294" name="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" path="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" size="7178" stream="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_rej_BadHadJetfalse.gif" attr="" comment="" date="1195040476" name="para_check_rej_BadHadJetfalse.gif" path="para_check_rej_BadHadJetfalse.gif" size="7207" stream="para_check_rej_BadHadJetfalse.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" attr="" comment="" date="1195040501" name="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" path="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" size="7234" stream="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="jpm_good.gif" attr="" comment="" date="1195043980" name="jpm_good.gif" path="jpm_good.gif" size="6957" stream="jpm_good.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="aplanarity_ttnj.gif" attr="" comment="" date="1195051186" name="aplanarity_ttnj.gif" path="aplanarity_ttnj.gif" size="5398" stream="aplanarity_ttnj.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="centrality_ttnj.gif" attr="" comment="" date="1195051195" name="centrality_ttnj.gif" path="centrality_ttnj.gif" size="8467" stream="centrality_ttnj.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_sumet3_take2.gif" attr="" comment="" date="1195051897" name="ttnj_sumet3_take2.gif" path="ttnj_sumet3_take2.gif" size="7818" stream="ttnj_sumet3_take2.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_jjmean.gif" attr="" comment="" date="1195052007" name="ttnj_jjmean.gif" path="ttnj_jjmean.gif" size="9522" stream="ttnj_jjmean.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_jjdiff.gif" attr="" comment="" date="1195052017" name="ttnj_jjdiff.gif" path="ttnj_jjdiff.gif" size="9600" stream="ttnj_jjdiff.gif" user="Main.SangUnAhn" version="1"

Revision 82008-01-23 - SangUnAhn

 
META TOPICPARENT name="SangUnAhnsLog"

November 2007

At first I started off by calculating the missing transverse energy corresponding to lepton neutrino. It is easy to get the MET through some modules, but to calculate total missing energy is not easy rather hard-working. Therefore I have chosen the fully hadronic channel because it is more instructive at the moment. After finishing fully hadronic channel, the analysis of the semi-leptonic channel will be performed. I suppose the study of fully hadronic channel could be helpful to analyze the semi-leptonic channel because it has not only leptonic channel but also half hadronic channel. Jeewon also has started studying fully hadronic channel. However we are following slightly different ways. I focused on the event selection cuts and she centred on QCD background. 13.11.2007

Fully hadronic channel

  • Some features :
    • Large QCD backgrounds
    • Need not to take into account the missing energy (neutrinos)
    • Largiest branching ratio ~ 46%
    • Two leading jets are considered as b-jets
      • b-tagging are not performed in this analysis but it will be taken into account later

Framework and samples

Preliminary

Jet efficiency
  • Tried to make efficiency plots by varying the number of jets in events
  • Tried to see the effect to the efficiency by adjusting the parameters corresponding to jest in analysis.cfg
    • Event rejection decision : rej_BadHardJet = TRUE ro FALSE
    • Primary and final accpetance pt cut, 20 GeV and 30 GeV, respectively
    • Also eta cuts for primary and final acceptance : Max = 5
    • Extrapolation error adjustment(in cm) :
      • reco_jetD0ErrorThresh = 0.05
      • reco_jetDzErrorThresh = 0.10
      • reco_bjetD0ErrorThresh = 0.5
      • reco_bjetDzErrorThresh = 0.20
  • 4jets event for example
    • Rejection Bad Hard jet = True
      • jetD0 and DzErrorThresh : jetD0ErrorThresh = 0 & jetDzErrorThresh = 0 ( bjet cases are non-zero )
Changed:
<
<
      • para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif
>
>
      • para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif
 
      • bjetD0 and DzErrorThresh : bjetD0ErrorThresh = 0 & bjetDzErrorThresh = 0
Changed:
<
<
      • para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif
>
>
      • para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif
 
    • Rejection Bad Hard jet = false
      • Extrapolation error adjustment are all zero
Changed:
<
<
      • para_check_rej_BadHadJetfalse.gif
>
>
      • para_check_rej_BadHadJetfalse.gif
 
      • Extrapolation error adjustment are non-zero
Changed:
<
<
      • para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif
>
>
      • para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif
 
  • Simple conclusion :
    • Efficiency increased when the extrapolation error adjustment implemented, especially non-bjet cuts
    • Rejection bad hard jet cuts can decrease the efficiency slightly

Event selection

Sum of non-leading jests
  • Non-leading jet total transverse energy obtained removing the two most energetic jets
  • Sum_3 >= 148 GeV
Changed:
<
<
  • ttnj_sumet3_take2.gif
>
>
  • ttnj_sumet3_take2.gif
 
Verifying jet-parton-matching
  • The six partons in fully hadronic channel are matched to six reconstruced jets by picking the matching which minimises the sum of the angular seperation between reconstructed jet and matched parton. CMS Notes
    • good jet-parton-matching : Each of the six partons and jets differ only by 15(deg) and the jet-reconstructed tops also differ only by 15(deg) from their corresponding parton-level direction.
    • half-good jet-parton-matching : Three of the partons and jets forming one top differ only by 15(deg) and this jet-reconstructed top also differ only by 15(deg) from his corresponding parton-level direction.
    • bad jet-parton-matching : Everthing else.
  • SusyAnalyzer has own MatchObject class, so I tried to verify how it is efficient by using this method.
  • As results, the value of 15(deg) is somewhat arbitrary but all matching objects are good.
  • i.e. total six jets and partons, so 6 * 15 = 90(deg). the distribution for good jet-parton-mathing shows well below 90(deg)
Changed:
<
<
jpm_good.gif
>
>
jpm_good.gif
 
  • half-good jet-parton-mathing will be performed after correct top signal obtained
The other event selection cuts
Centrality
  • Centrality C >= 0.68
    • the fraction of the hard scatter energy going in the transverse plane.
Changed:
<
<
    • centrality_ttnj.gif
>
>
    • centrality_ttnj.gif
 
Aplanarity
  • Aplanarity A >= 0.024
    • A = 3/2 * Q : Q being the smallest of the three normalized eigenvalues of the sphericity tensor
    • Choose 3rd eigenvalues in TMatrixDEigen Class
Changed:
<
<
    • aplanarity_ttnj.gif
>
>
    • aplanarity_ttnj.gif
 

Jet-pairing

Plan to do
average of the W candidates' masses
ttnj_jjmean.gif
difference of the W candidates' masses
ttnj_jjdiff.gif
sum of the W candidates' jet-angles
difference of the top-candidates' masses
sum of the top-candidates' jet-angles
angle between the top-candidates

-- SangUnAhn - 13 Nov 2007

META FILEATTACHMENT attachment="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" attr="" comment="" date="1195039286" name="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" path="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" size="7275" stream="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" attr="" comment="" date="1195039294" name="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" path="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" size="7178" stream="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_rej_BadHadJetfalse.gif" attr="" comment="" date="1195040476" name="para_check_rej_BadHadJetfalse.gif" path="para_check_rej_BadHadJetfalse.gif" size="7207" stream="para_check_rej_BadHadJetfalse.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" attr="" comment="" date="1195040501" name="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" path="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" size="7234" stream="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="jpm_good.gif" attr="" comment="" date="1195043980" name="jpm_good.gif" path="jpm_good.gif" size="6957" stream="jpm_good.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="aplanarity_ttnj.gif" attr="" comment="" date="1195051186" name="aplanarity_ttnj.gif" path="aplanarity_ttnj.gif" size="5398" stream="aplanarity_ttnj.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="centrality_ttnj.gif" attr="" comment="" date="1195051195" name="centrality_ttnj.gif" path="centrality_ttnj.gif" size="8467" stream="centrality_ttnj.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_sumet3_take2.gif" attr="" comment="" date="1195051897" name="ttnj_sumet3_take2.gif" path="ttnj_sumet3_take2.gif" size="7818" stream="ttnj_sumet3_take2.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_jjmean.gif" attr="" comment="" date="1195052007" name="ttnj_jjmean.gif" path="ttnj_jjmean.gif" size="9522" stream="ttnj_jjmean.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_jjdiff.gif" attr="" comment="" date="1195052017" name="ttnj_jjdiff.gif" path="ttnj_jjdiff.gif" size="9600" stream="ttnj_jjdiff.gif" user="Main.SangUnAhn" version="1"

Revision 72007-12-10 - SangUnAhn

 
META TOPICPARENT name="SangUnAhnsLog"

November 2007

At first I started off by calculating the missing transverse energy corresponding to lepton neutrino. It is easy to get the MET through some modules, but to calculate total missing energy is not easy rather hard-working. Therefore I have chosen the fully hadronic channel because it is more instructive at the moment. After finishing fully hadronic channel, the analysis of the semi-leptonic channel will be performed. I suppose the study of fully hadronic channel could be helpful to analyze the semi-leptonic channel because it has not only leptonic channel but also half hadronic channel. Jeewon also has started studying fully hadronic channel. However we are following slightly different ways. I focused on the event selection cuts and she centred on QCD background. 13.11.2007

Fully hadronic channel

  • Some features :
    • Large QCD backgrounds
    • Need not to take into account the missing energy (neutrinos)
    • Largiest branching ratio ~ 46%
    • Two leading jets are considered as b-jets
      • b-tagging are not performed in this analysis but it will be taken into account later

Framework and samples

Preliminary

Jet efficiency
  • Tried to make efficiency plots by varying the number of jets in events
  • Tried to see the effect to the efficiency by adjusting the parameters corresponding to jest in analysis.cfg
    • Event rejection decision : rej_BadHardJet = TRUE ro FALSE
    • Primary and final accpetance pt cut, 20 GeV and 30 GeV, respectively
    • Also eta cuts for primary and final acceptance : Max = 5
    • Extrapolation error adjustment(in cm) :
      • reco_jetD0ErrorThresh = 0.05
      • reco_jetDzErrorThresh = 0.10
      • reco_bjetD0ErrorThresh = 0.5
      • reco_bjetDzErrorThresh = 0.20
  • 4jets event for example
    • Rejection Bad Hard jet = True
      • jetD0 and DzErrorThresh : jetD0ErrorThresh = 0 & jetDzErrorThresh = 0 ( bjet cases are non-zero )
      • para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif
      • bjetD0 and DzErrorThresh : bjetD0ErrorThresh = 0 & bjetDzErrorThresh = 0
      • para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif
    • Rejection Bad Hard jet = false
      • Extrapolation error adjustment are all zero
      • para_check_rej_BadHadJetfalse.gif
      • Extrapolation error adjustment are non-zero
      • para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif
  • Simple conclusion :
    • Efficiency increased when the extrapolation error adjustment implemented, especially non-bjet cuts
    • Rejection bad hard jet cuts can decrease the efficiency slightly

Event selection

Sum of non-leading jests
  • Non-leading jet total transverse energy obtained removing the two most energetic jets
  • Sum_3 >= 148 GeV
  • ttnj_sumet3_take2.gif
Verifying jet-parton-matching
  • The six partons in fully hadronic channel are matched to six reconstruced jets by picking the matching which minimises the sum of the angular seperation between reconstructed jet and matched parton. CMS Notes
    • good jet-parton-matching : Each of the six partons and jets differ only by 15(deg) and the jet-reconstructed tops also differ only by 15(deg) from their corresponding parton-level direction.
    • half-good jet-parton-matching : Three of the partons and jets forming one top differ only by 15(deg) and this jet-reconstructed top also differ only by 15(deg) from his corresponding parton-level direction.
    • bad jet-parton-matching : Everthing else.
  • SusyAnalyzer has own MatchObject class, so I tried to verify how it is efficient by using this method.
  • As results, the value of 15(deg) is somewhat arbitrary but all matching objects are good.
  • i.e. total six jets and partons, so 6 * 15 = 90(deg). the distribution for good jet-parton-mathing shows well below 90(deg)

jpm_good.gif

  • half-good jet-parton-mathing will be performed after correct top signal obtained
The other event selection cuts
Centrality
  • Centrality C >= 0.68
    • the fraction of the hard scatter energy going in the transverse plane.
    • centrality_ttnj.gif
Aplanarity

Jet-pairing

Plan to do
average of the W candidates' masses
ttnj_jjmean.gif
difference of the W candidates' masses
ttnj_jjdiff.gif
sum of the W candidates' jet-angles
difference of the top-candidates' masses
sum of the top-candidates' jet-angles
angle between the top-candidates

-- SangUnAhn - 13 Nov 2007

META FILEATTACHMENT attachment="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" attr="" comment="" date="1195039286" name="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" path="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" size="7275" stream="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" attr="" comment="" date="1195039294" name="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" path="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" size="7178" stream="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_rej_BadHadJetfalse.gif" attr="" comment="" date="1195040476" name="para_check_rej_BadHadJetfalse.gif" path="para_check_rej_BadHadJetfalse.gif" size="7207" stream="para_check_rej_BadHadJetfalse.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" attr="" comment="" date="1195040501" name="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" path="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" size="7234" stream="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="jpm_good.gif" attr="" comment="" date="1195043980" name="jpm_good.gif" path="jpm_good.gif" size="6957" stream="jpm_good.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="aplanarity_ttnj.gif" attr="" comment="" date="1195051186" name="aplanarity_ttnj.gif" path="aplanarity_ttnj.gif" size="5398" stream="aplanarity_ttnj.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="centrality_ttnj.gif" attr="" comment="" date="1195051195" name="centrality_ttnj.gif" path="centrality_ttnj.gif" size="8467" stream="centrality_ttnj.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_sumet3_take2.gif" attr="" comment="" date="1195051897" name="ttnj_sumet3_take2.gif" path="ttnj_sumet3_take2.gif" size="7818" stream="ttnj_sumet3_take2.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_jjmean.gif" attr="" comment="" date="1195052007" name="ttnj_jjmean.gif" path="ttnj_jjmean.gif" size="9522" stream="ttnj_jjmean.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_jjdiff.gif" attr="" comment="" date="1195052017" name="ttnj_jjdiff.gif" path="ttnj_jjdiff.gif" size="9600" stream="ttnj_jjdiff.gif" user="Main.SangUnAhn" version="1"

Revision 62007-11-19 - SangUnAhn

 
META TOPICPARENT name="SangUnAhnsLog"

November 2007

Added:
>
>
  At first I started off by calculating the missing transverse energy corresponding to lepton neutrino. It is easy to get the MET through some modules, but to calculate total missing energy is not easy rather hard-working. Therefore I have chosen the fully hadronic channel because it is more instructive at the moment. After finishing fully hadronic channel, the analysis of the semi-leptonic channel will be performed. I suppose the study of fully hadronic channel could be helpful to analyze the semi-leptonic channel because it has not only leptonic channel but also half hadronic channel. Jeewon also has started studying fully hadronic channel. However we are following slightly different ways. I focused on the event selection cuts and she centred on QCD background. 13.11.2007

Fully hadronic channel

  • Some features :
    • Large QCD backgrounds
    • Need not to take into account the missing energy (neutrinos)
    • Largiest branching ratio ~ 46%
    • Two leading jets are considered as b-jets
      • b-tagging are not performed in this analysis but it will be taken into account later

Framework and samples

Preliminary

Jet efficiency
  • Tried to make efficiency plots by varying the number of jets in events
  • Tried to see the effect to the efficiency by adjusting the parameters corresponding to jest in analysis.cfg
    • Event rejection decision : rej_BadHardJet = TRUE ro FALSE
    • Primary and final accpetance pt cut, 20 GeV and 30 GeV, respectively
    • Also eta cuts for primary and final acceptance : Max = 5
    • Extrapolation error adjustment(in cm) :
      • reco_jetD0ErrorThresh = 0.05
      • reco_jetDzErrorThresh = 0.10
      • reco_bjetD0ErrorThresh = 0.5
      • reco_bjetDzErrorThresh = 0.20
  • 4jets event for example
    • Rejection Bad Hard jet = True
      • jetD0 and DzErrorThresh : jetD0ErrorThresh = 0 & jetDzErrorThresh = 0 ( bjet cases are non-zero )
      • para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif
      • bjetD0 and DzErrorThresh : bjetD0ErrorThresh = 0 & bjetDzErrorThresh = 0
      • para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif
    • Rejection Bad Hard jet = false
      • Extrapolation error adjustment are all zero
      • para_check_rej_BadHadJetfalse.gif
      • Extrapolation error adjustment are non-zero
      • para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif
  • Simple conclusion :
    • Efficiency increased when the extrapolation error adjustment implemented, especially non-bjet cuts
    • Rejection bad hard jet cuts can decrease the efficiency slightly

Event selection

Sum of non-leading jests
  • Non-leading jet total transverse energy obtained removing the two most energetic jets
  • Sum_3 >= 148 GeV
  • ttnj_sumet3_take2.gif
Verifying jet-parton-matching
  • The six partons in fully hadronic channel are matched to six reconstruced jets by picking the matching which minimises the sum of the angular seperation between reconstructed jet and matched parton. CMS Notes
    • good jet-parton-matching : Each of the six partons and jets differ only by 15(deg) and the jet-reconstructed tops also differ only by 15(deg) from their corresponding parton-level direction.
    • half-good jet-parton-matching : Three of the partons and jets forming one top differ only by 15(deg) and this jet-reconstructed top also differ only by 15(deg) from his corresponding parton-level direction.
    • bad jet-parton-matching : Everthing else.
  • SusyAnalyzer has own MatchObject class, so I tried to verify how it is efficient by using this method.
  • As results, the value of 15(deg) is somewhat arbitrary but all matching objects are good.
  • i.e. total six jets and partons, so 6 * 15 = 90(deg). the distribution for good jet-parton-mathing shows well below 90(deg)

jpm_good.gif

  • half-good jet-parton-mathing will be performed after correct top signal obtained
The other event selection cuts
Centrality
  • Centrality C >= 0.68
    • the fraction of the hard scatter energy going in the transverse plane.
    • centrality_ttnj.gif
Aplanarity

Jet-pairing

Plan to do
average of the W candidates' masses
ttnj_jjmean.gif
difference of the W candidates' masses
ttnj_jjdiff.gif
sum of the W candidates' jet-angles
difference of the top-candidates' masses
sum of the top-candidates' jet-angles
angle between the top-candidates

-- SangUnAhn - 13 Nov 2007

META FILEATTACHMENT attachment="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" attr="" comment="" date="1195039286" name="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" path="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" size="7275" stream="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" attr="" comment="" date="1195039294" name="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" path="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" size="7178" stream="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_rej_BadHadJetfalse.gif" attr="" comment="" date="1195040476" name="para_check_rej_BadHadJetfalse.gif" path="para_check_rej_BadHadJetfalse.gif" size="7207" stream="para_check_rej_BadHadJetfalse.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" attr="" comment="" date="1195040501" name="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" path="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" size="7234" stream="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="jpm_good.gif" attr="" comment="" date="1195043980" name="jpm_good.gif" path="jpm_good.gif" size="6957" stream="jpm_good.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="aplanarity_ttnj.gif" attr="" comment="" date="1195051186" name="aplanarity_ttnj.gif" path="aplanarity_ttnj.gif" size="5398" stream="aplanarity_ttnj.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="centrality_ttnj.gif" attr="" comment="" date="1195051195" name="centrality_ttnj.gif" path="centrality_ttnj.gif" size="8467" stream="centrality_ttnj.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_sumet3_take2.gif" attr="" comment="" date="1195051897" name="ttnj_sumet3_take2.gif" path="ttnj_sumet3_take2.gif" size="7818" stream="ttnj_sumet3_take2.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_jjmean.gif" attr="" comment="" date="1195052007" name="ttnj_jjmean.gif" path="ttnj_jjmean.gif" size="9522" stream="ttnj_jjmean.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_jjdiff.gif" attr="" comment="" date="1195052017" name="ttnj_jjdiff.gif" path="ttnj_jjdiff.gif" size="9600" stream="ttnj_jjdiff.gif" user="Main.SangUnAhn" version="1"

Revision 52007-11-14 - SangUnAhn

 
META TOPICPARENT name="SangUnAhnsLog"

November 2007

At first I started off by calculating the missing transverse energy corresponding to lepton neutrino. It is easy to get the MET through some modules, but to calculate total missing energy is not easy rather hard-working. Therefore I have chosen the fully hadronic channel because it is more instructive at the moment. After finishing fully hadronic channel, the analysis of the semi-leptonic channel will be performed. I suppose the study of fully hadronic channel could be helpful to analyze the semi-leptonic channel because it has not only leptonic channel but also half hadronic channel. Jeewon also has started studying fully hadronic channel. However we are following slightly different ways. I focused on the event selection cuts and she centred on QCD background. 13.11.2007

Fully hadronic channel

  • Some features :
    • Large QCD backgrounds
    • Need not to take into account the missing energy (neutrinos)
    • Largiest branching ratio ~ 46%
    • Two leading jets are considered as b-jets
      • b-tagging are not performed in this analysis but it will be taken into account later

Framework and samples

Preliminary

Jet efficiency
  • Tried to make efficiency plots by varying the number of jets in events
  • Tried to see the effect to the efficiency by adjusting the parameters corresponding to jest in analysis.cfg
    • Event rejection decision : rej_BadHardJet = TRUE ro FALSE
    • Primary and final accpetance pt cut, 20 GeV and 30 GeV, respectively
    • Also eta cuts for primary and final acceptance : Max = 5
    • Extrapolation error adjustment(in cm) :
      • reco_jetD0ErrorThresh = 0.05
      • reco_jetDzErrorThresh = 0.10
      • reco_bjetD0ErrorThresh = 0.5
      • reco_bjetDzErrorThresh = 0.20
  • 4jets event for example
    • Rejection Bad Hard jet = True
      • jetD0 and DzErrorThresh : jetD0ErrorThresh = 0 & jetDzErrorThresh = 0 ( bjet cases are non-zero )
      • para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif
      • bjetD0 and DzErrorThresh : bjetD0ErrorThresh = 0 & bjetDzErrorThresh = 0
      • para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif
    • Rejection Bad Hard jet = false
      • Extrapolation error adjustment are all zero
      • para_check_rej_BadHadJetfalse.gif
      • Extrapolation error adjustment are non-zero
      • para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif
  • Simple conclusion :
    • Efficiency increased when the extrapolation error adjustment implemented, especially non-bjet cuts
    • Rejection bad hard jet cuts can decrease the efficiency slightly

Event selection

Sum of non-leading jests
  • Non-leading jet total transverse energy obtained removing the two most energetic jets
  • Sum_3 >= 148 GeV
Changed:
<
<
  • ttnj_sumet3.gif
>
>
  • ttnj_sumet3_take2.gif
 
Verifying jet-parton-matching
  • The six partons in fully hadronic channel are matched to six reconstruced jets by picking the matching which minimises the sum of the angular seperation between reconstructed jet and matched parton. CMS Notes
    • good jet-parton-matching : Each of the six partons and jets differ only by 15(deg) and the jet-reconstructed tops also differ only by 15(deg) from their corresponding parton-level direction.
    • half-good jet-parton-matching : Three of the partons and jets forming one top differ only by 15(deg) and this jet-reconstructed top also differ only by 15(deg) from his corresponding parton-level direction.
    • bad jet-parton-matching : Everthing else.
  • SusyAnalyzer has own MatchObject class, so I tried to verify how it is efficient by using this method.
  • As results, the value of 15(deg) is somewhat arbitrary but all matching objects are good.
  • i.e. total six jets and partons, so 6 * 15 = 90(deg). the distribution for good jet-parton-mathing shows well below 90(deg)

jpm_good.gif

  • half-good jet-parton-mathing will be performed after correct top signal obtained
The other event selection cuts
Centrality
  • Centrality C >= 0.68
    • the fraction of the hard scatter energy going in the transverse plane.
    • centrality_ttnj.gif
Aplanarity

Jet-pairing

Plan to do
average of the W candidates' masses
Changed:
<
<
https://tier2.uos.ac.kr/pub/OldWebs/OldWebs/DAQ/Nov2007/
>
>
ttnj_jjmean.gif
 
difference of the W candidates' masses
Changed:
<
<
https://tier2.uos.ac.kr/pub/OldWebs/OldWebs/DAQ/Nov2007/
>
>
ttnj_jjdiff.gif
 
sum of the W candidates' jet-angles
difference of the top-candidates' masses
sum of the top-candidates' jet-angles
angle between the top-candidates

-- SangUnAhn - 13 Nov 2007

META FILEATTACHMENT attachment="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" attr="" comment="" date="1195039286" name="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" path="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" size="7275" stream="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" attr="" comment="" date="1195039294" name="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" path="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" size="7178" stream="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_rej_BadHadJetfalse.gif" attr="" comment="" date="1195040476" name="para_check_rej_BadHadJetfalse.gif" path="para_check_rej_BadHadJetfalse.gif" size="7207" stream="para_check_rej_BadHadJetfalse.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" attr="" comment="" date="1195040501" name="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" path="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" size="7234" stream="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="jpm_good.gif" attr="" comment="" date="1195043980" name="jpm_good.gif" path="jpm_good.gif" size="6957" stream="jpm_good.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="aplanarity_ttnj.gif" attr="" comment="" date="1195051186" name="aplanarity_ttnj.gif" path="aplanarity_ttnj.gif" size="5398" stream="aplanarity_ttnj.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="centrality_ttnj.gif" attr="" comment="" date="1195051195" name="centrality_ttnj.gif" path="centrality_ttnj.gif" size="8467" stream="centrality_ttnj.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_sumet3_take2.gif" attr="" comment="" date="1195051897" name="ttnj_sumet3_take2.gif" path="ttnj_sumet3_take2.gif" size="7818" stream="ttnj_sumet3_take2.gif" user="Main.SangUnAhn" version="1"
Added:
>
>
META FILEATTACHMENT attachment="ttnj_jjmean.gif" attr="" comment="" date="1195052007" name="ttnj_jjmean.gif" path="ttnj_jjmean.gif" size="9522" stream="ttnj_jjmean.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_jjdiff.gif" attr="" comment="" date="1195052017" name="ttnj_jjdiff.gif" path="ttnj_jjdiff.gif" size="9600" stream="ttnj_jjdiff.gif" user="Main.SangUnAhn" version="1"
 

Revision 42007-11-14 - SangUnAhn

 
META TOPICPARENT name="SangUnAhnsLog"

November 2007

Changed:
<
<
At first I started off by calculating the missing transverse energy corresponding to lepton neutrino. It is easy to get the MET through some modules, but to calculate total missing energy is not easy rather hard-working. Therefore I have chosen the fully hadronic channel because it is more instructive at the moment. After finishing fully hadronic channel the semi-leptonic channel will be taken into account. I suppose the study of fully hadronic channel could be helpful to analyze the semi-leptonic channel because it has not only leptonic channel but also half hadronic channel. Jeewon also has started studying fully hadronic channel. However we are following slightly different ways. I focused on the event selection cuts and she centred on QCD background. 13.11.2007
>
>
At first I started off by calculating the missing transverse energy corresponding to lepton neutrino. It is easy to get the MET through some modules, but to calculate total missing energy is not easy rather hard-working. Therefore I have chosen the fully hadronic channel because it is more instructive at the moment. After finishing fully hadronic channel, the analysis of the semi-leptonic channel will be performed. I suppose the study of fully hadronic channel could be helpful to analyze the semi-leptonic channel because it has not only leptonic channel but also half hadronic channel. Jeewon also has started studying fully hadronic channel. However we are following slightly different ways. I focused on the event selection cuts and she centred on QCD background. 13.11.2007
 

Fully hadronic channel

  • Some features :
    • Large QCD backgrounds
    • Need not to take into account the missing energy (neutrinos)
    • Largiest branching ratio ~ 46%
    • Two leading jets are considered as b-jets
      • b-tagging are not performed in this analysis but it will be taken into account later

Framework and samples

Preliminary

Jet efficiency
  • Tried to make efficiency plots by varying the number of jets in events
  • Tried to see the effect to the efficiency by adjusting the parameters corresponding to jest in analysis.cfg
    • Event rejection decision : rej_BadHardJet = TRUE ro FALSE
    • Primary and final accpetance pt cut, 20 GeV and 30 GeV, respectively
    • Also eta cuts for primary and final acceptance : Max = 5
    • Extrapolation error adjustment(in cm) :
      • reco_jetD0ErrorThresh = 0.05
      • reco_jetDzErrorThresh = 0.10
      • reco_bjetD0ErrorThresh = 0.5
      • reco_bjetDzErrorThresh = 0.20
  • 4jets event for example
    • Rejection Bad Hard jet = True
      • jetD0 and DzErrorThresh : jetD0ErrorThresh = 0 & jetDzErrorThresh = 0 ( bjet cases are non-zero )
Changed:
<
<
      • para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif
>
>
      • para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif
 
      • bjetD0 and DzErrorThresh : bjetD0ErrorThresh = 0 & bjetDzErrorThresh = 0
Changed:
<
<
      • para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif
>
>
      • para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif
 
    • Rejection Bad Hard jet = false
      • Extrapolation error adjustment are all zero
Changed:
<
<
      • para_check_rej_BadHadJetfalse.gif
>
>
      • para_check_rej_BadHadJetfalse.gif
 
      • Extrapolation error adjustment are non-zero
Changed:
<
<
      • para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif
>
>
      • para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif
 
  • Simple conclusion :
    • Efficiency increased when the extrapolation error adjustment implemented, especially non-bjet cuts
    • Rejection bad hard jet cuts can decrease the efficiency slightly

Event selection

Sum of non-leading jests
  • Non-leading jet total transverse energy obtained removing the two most energetic jets
  • Sum_3 >= 148 GeV
Changed:
<
<
  • sumet3.gif
>
>
  • ttnj_sumet3.gif
 
Verifying jet-parton-matching
  • The six partons in fully hadronic channel are matched to six reconstruced jets by picking the matching which minimises the sum of the angular seperation between reconstructed jet and matched parton. CMS Notes
    • good jet-parton-matching : Each of the six partons and jets differ only by 15(deg) and the jet-reconstructed tops also differ only by 15(deg) from their corresponding parton-level direction.
    • half-good jet-parton-matching : Three of the partons and jets forming one top differ only by 15(deg) and this jet-reconstructed top also differ only by 15(deg) from his corresponding parton-level direction.
    • bad jet-parton-matching : Everthing else.
  • SusyAnalyzer has own MatchObject class, so I tried to verify how it is efficient by using this method.
  • As results, the value of 15(deg) is somewhat arbitrary but all matching objects are good.
  • i.e. total six jets and partons, so 6 * 15 = 90(deg). the distribution for good jet-parton-mathing shows well below 90(deg)
Changed:
<
<
jpm_good.gif
>
>
jpm_good.gif
Added:
>
>
  • half-good jet-parton-mathing will be performed after correct top signal obtained
 
The other event selection cuts
Centrality
  • Centrality C >= 0.68
    • the fraction of the hard scatter energy going in the transverse plane.
Added:
>
>
    • centrality_ttnj.gif
 
Aplanarity
  • Aplanarity A >= 0.024
    • A = 3/2 * Q : Q being the smallest of the three normalized eigenvalues of the sphericity tensor
    • Choose 3rd eigenvalues in TMatrixDEigen Class
Added:
>
>
    • aplanarity_ttnj.gif
 
Added:
>
>

Jet-pairing

Plan to do
average of the W candidates' masses
https://tier2.uos.ac.kr/pub/OldWebs/OldWebs/DAQ/Nov2007/
difference of the W candidates' masses
https://tier2.uos.ac.kr/pub/OldWebs/OldWebs/DAQ/Nov2007/
sum of the W candidates' jet-angles
difference of the top-candidates' masses
sum of the top-candidates' jet-angles
angle between the top-candidates
 -- SangUnAhn - 13 Nov 2007

META FILEATTACHMENT attachment="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" attr="" comment="" date="1195039286" name="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" path="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" size="7275" stream="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" attr="" comment="" date="1195039294" name="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" path="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" size="7178" stream="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_rej_BadHadJetfalse.gif" attr="" comment="" date="1195040476" name="para_check_rej_BadHadJetfalse.gif" path="para_check_rej_BadHadJetfalse.gif" size="7207" stream="para_check_rej_BadHadJetfalse.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" attr="" comment="" date="1195040501" name="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" path="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" size="7234" stream="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" user="Main.SangUnAhn" version="1"
Deleted:
<
<
META FILEATTACHMENT attachment="sumet3.gif" attr="" comment="" date="1195043807" name="sumet3.gif" path="sumet3.gif" size="8626" stream="sumet3.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="sum3.gif" attr="" comment="" date="1195043873" name="sum3.gif" path="sum3.gif" size="7410" stream="sum3.gif" user="Main.SangUnAhn" version="1"
 
META FILEATTACHMENT attachment="jpm_good.gif" attr="" comment="" date="1195043980" name="jpm_good.gif" path="jpm_good.gif" size="6957" stream="jpm_good.gif" user="Main.SangUnAhn" version="1"
Added:
>
>
META FILEATTACHMENT attachment="aplanarity_ttnj.gif" attr="" comment="" date="1195051186" name="aplanarity_ttnj.gif" path="aplanarity_ttnj.gif" size="5398" stream="aplanarity_ttnj.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="centrality_ttnj.gif" attr="" comment="" date="1195051195" name="centrality_ttnj.gif" path="centrality_ttnj.gif" size="8467" stream="centrality_ttnj.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="ttnj_sumet3_take2.gif" attr="" comment="" date="1195051897" name="ttnj_sumet3_take2.gif" path="ttnj_sumet3_take2.gif" size="7818" stream="ttnj_sumet3_take2.gif" user="Main.SangUnAhn" version="1"
 

Revision 32007-11-14 - SangUnAhn

 
META TOPICPARENT name="SangUnAhnsLog"

November 2007

At first I started off by calculating the missing transverse energy corresponding to lepton neutrino. It is easy to get the MET through some modules, but to calculate total missing energy is not easy rather hard-working. Therefore I have chosen the fully hadronic channel because it is more instructive at the moment. After finishing fully hadronic channel the semi-leptonic channel will be taken into account. I suppose the study of fully hadronic channel could be helpful to analyze the semi-leptonic channel because it has not only leptonic channel but also half hadronic channel. Jeewon also has started studying fully hadronic channel. However we are following slightly different ways. I focused on the event selection cuts and she centred on QCD background. 13.11.2007

Fully hadronic channel

  • Some features :
    • Large QCD backgrounds
    • Need not to take into account the missing energy (neutrinos)
    • Largiest branching ratio ~ 46%
    • Two leading jets are considered as b-jets
      • b-tagging are not performed in this analysis but it will be taken into account later

Framework and samples

Preliminary

Jet efficiency
  • Tried to make efficiency plots by varying the number of jets in events
  • Tried to see the effect to the efficiency by adjusting the parameters corresponding to jest in analysis.cfg
    • Event rejection decision : rej_BadHardJet = TRUE ro FALSE
    • Primary and final accpetance pt cut, 20 GeV and 30 GeV, respectively
    • Also eta cuts for primary and final acceptance : Max = 5
    • Extrapolation error adjustment(in cm) :
      • reco_jetD0ErrorThresh = 0.05
      • reco_jetDzErrorThresh = 0.10
      • reco_bjetD0ErrorThresh = 0.5
      • reco_bjetDzErrorThresh = 0.20
Added:
>
>
  • 4jets event for example
    • Rejection Bad Hard jet = True
      • jetD0 and DzErrorThresh : jetD0ErrorThresh = 0 & jetDzErrorThresh = 0 ( bjet cases are non-zero )
      • para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif
      • bjetD0 and DzErrorThresh : bjetD0ErrorThresh = 0 & bjetDzErrorThresh = 0
      • para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif
    • Rejection Bad Hard jet = false
      • Extrapolation error adjustment are all zero
      • para_check_rej_BadHadJetfalse.gif
      • Extrapolation error adjustment are non-zero
      • para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif
  • Simple conclusion :
    • Efficiency increased when the extrapolation error adjustment implemented, especially non-bjet cuts
    • Rejection bad hard jet cuts can decrease the efficiency slightly
 

Event selection

Sum of non-leading jests
  • Non-leading jet total transverse energy obtained removing the two most energetic jets
  • Sum_3 >= 148 GeV
Added:
>
>
  • sumet3.gif
 
Verifying jet-parton-matching
  • The six partons in fully hadronic channel are matched to six reconstruced jets by picking the matching which minimises the sum of the angular seperation between reconstructed jet and matched parton. CMS Notes
    • good jet-parton-matching : Each of the six partons and jets differ only by 15(deg) and the jet-reconstructed tops also differ only by 15(deg) from their corresponding parton-level direction.
    • half-good jet-parton-matching : Three of the partons and jets forming one top differ only by 15(deg) and this jet-reconstructed top also differ only by 15(deg) from his corresponding parton-level direction.
    • bad jet-parton-matching : Everthing else.
  • SusyAnalyzer has own MatchObject class, so I tried to verify how it is efficient by using this method.
  • As results, the value of 15(deg) is somewhat arbitrary but all matching objects are good.
  • i.e. total six jets and partons, so 6 * 15 = 90(deg). the distribution for good jet-parton-mathing shows well below 90(deg)
Added:
>
>
jpm_good.gif
 
The other event selection cuts
Centrality
  • Centrality C >= 0.68
    • the fraction of the hard scatter energy going in the transverse plane.
Aplanarity
-- SangUnAhn - 13 Nov 2007
Added:
>
>
META FILEATTACHMENT attachment="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" attr="" comment="" date="1195039286" name="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" path="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" size="7275" stream="para_check_D0DzErrorThreshJetallzeroBJetnonzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" attr="" comment="" date="1195039294" name="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" path="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" size="7178" stream="para_check_D0DzErrorThreshJetnonzeroBJetallzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_rej_BadHadJetfalse.gif" attr="" comment="" date="1195040476" name="para_check_rej_BadHadJetfalse.gif" path="para_check_rej_BadHadJetfalse.gif" size="7207" stream="para_check_rej_BadHadJetfalse.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" attr="" comment="" date="1195040501" name="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" path="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" size="7234" stream="para_check_rej_BadHadJetfalse_D0DzErrorThreshAllnonzero.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="sumet3.gif" attr="" comment="" date="1195043807" name="sumet3.gif" path="sumet3.gif" size="8626" stream="sumet3.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="sum3.gif" attr="" comment="" date="1195043873" name="sum3.gif" path="sum3.gif" size="7410" stream="sum3.gif" user="Main.SangUnAhn" version="1"
META FILEATTACHMENT attachment="jpm_good.gif" attr="" comment="" date="1195043980" name="jpm_good.gif" path="jpm_good.gif" size="6957" stream="jpm_good.gif" user="Main.SangUnAhn" version="1"
 

Revision 22007-11-14 - SangUnAhn

 
META TOPICPARENT name="SangUnAhnsLog"

November 2007

Changed:
<
<

Semi-leptonic channel

>
>
At first I started off by calculating the missing transverse energy corresponding to lepton neutrino. It is easy to get the MET through some modules, but to calculate total missing energy is not easy rather hard-working. Therefore I have chosen the fully hadronic channel because it is more instructive at the moment. After finishing fully hadronic channel the semi-leptonic channel will be taken into account. I suppose the study of fully hadronic channel could be helpful to analyze the semi-leptonic channel because it has not only leptonic channel but also half hadronic channel. Jeewon also has started studying fully hadronic channel. However we are following slightly different ways. I focused on the event selection cuts and she centred on QCD background. 13.11.2007
Deleted:
<
<
At first I started off by calculating the missing transverse energy corresponding to lepton neutrino. It was easy to get the MET from some modules, however it would be hard-working to calculate total missing energies and fully hadronic channel is more instructive at the moment.
 

Fully hadronic channel

  • Some features :
    • Large QCD backgrounds
    • Need not to take into account the missing energy (neutrinos)
    • Largiest branching ratio ~ 46%
    • Two leading jets are considered as b-jets
      • b-tagging are not performed in this analysis but it will be taken into account later

Framework and samples

Changed:
<
<

Analysis

>
>

Preliminary

 
Jet efficiency
  • Tried to make efficiency plots by varying the number of jets in events
Changed:
<
<
  • Tried to see the effect of the parameters in analysis.cfg
>
>
  • Tried to see the effect to the efficiency by adjusting the parameters corresponding to jest in analysis.cfg
Added:
>
>
    • Event rejection decision : rej_BadHardJet = TRUE ro FALSE
    • Primary and final accpetance pt cut, 20 GeV and 30 GeV, respectively
    • Also eta cuts for primary and final acceptance : Max = 5
    • Extrapolation error adjustment(in cm) :
      • reco_jetD0ErrorThresh = 0.05
      • reco_jetDzErrorThresh = 0.10
      • reco_bjetD0ErrorThresh = 0.5
      • reco_bjetDzErrorThresh = 0.20
 
Added:
>
>

Event selection

Sum of non-leading jests
  • Non-leading jet total transverse energy obtained removing the two most energetic jets
  • Sum_3 >= 148 GeV
Verifying jet-parton-matching
  • The six partons in fully hadronic channel are matched to six reconstruced jets by picking the matching which minimises the sum of the angular seperation between reconstructed jet and matched parton. CMS Notes
    • good jet-parton-matching : Each of the six partons and jets differ only by 15(deg) and the jet-reconstructed tops also differ only by 15(deg) from their corresponding parton-level direction.
    • half-good jet-parton-matching : Three of the partons and jets forming one top differ only by 15(deg) and this jet-reconstructed top also differ only by 15(deg) from his corresponding parton-level direction.
    • bad jet-parton-matching : Everthing else.
  • SusyAnalyzer has own MatchObject class, so I tried to verify how it is efficient by using this method.
  • As results, the value of 15(deg) is somewhat arbitrary but all matching objects are good.
  • i.e. total six jets and partons, so 6 * 15 = 90(deg). the distribution for good jet-parton-mathing shows well below 90(deg)

The other event selection cuts
Centrality
  • Centrality C >= 0.68
    • the fraction of the hard scatter energy going in the transverse plane.
Aplanarity
 -- SangUnAhn - 13 Nov 2007

Revision 12007-11-13 - SangUnAhn

 
META TOPICPARENT name="SangUnAhnsLog"

November 2007

Semi-leptonic channel

At first I started off by calculating the missing transverse energy corresponding to lepton neutrino. It was easy to get the MET from some modules, however it would be hard-working to calculate total missing energies and fully hadronic channel is more instructive at the moment.

Fully hadronic channel

  • Some features :
    • Large QCD backgrounds
    • Need not to take into account the missing energy (neutrinos)
    • Largiest branching ratio ~ 46%
    • Two leading jets are considered as b-jets
      • b-tagging are not performed in this analysis but it will be taken into account later

Framework and samples

Analysis

Jet efficiency
  • Tried to make efficiency plots by varying the number of jets in events
  • Tried to see the effect of the parameters in analysis.cfg

-- SangUnAhn - 13 Nov 2007

 
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