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| META TOPICPARENT |
name="DongHosLog" |
Quarikonia Study
1. Motivation of Quarkonia (qqbar -> +mu -mu, J/psi, Upsilon family) Study at CMS (Fig. 1)
- Quarkonia's step-wise suppression at high pt region is the one of most direct probes of QGP (Quark-gluon-plasma)
- J/Psi's suppression is already observed in SPS and RHIC.
- So, how about it in CMS ? (there could be more huge suppression or enhanced regeneration ?) and how about Upsilon ?
What is more benefits of CMS than other experiments ?
- Increased energy : 5.5 TeV? (PbPb? collision) - 30 times more huge than RHIC (200 GeV? : AuAu?)
- It can make plasma hotter, longer-lived than RHIC (it can be easy to dissolute the particles which has large binding energy)
- provide good circumstances to produce Quarkonia highly
- high luminosities : 5*10^26 cm^-2 s^-1 (increase events rate)
- high gluon density at low-x, (the almost particles of heavy-flavor quarks is made by gluon-gluon fusion)
- New possibility of Upsilon family (Y, Y', Y'')
2. Quarkonia Generation with HYJET |
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>
> | 31X HYDJET production information (updated at 20090608)
* decache location : dcache:/pnfs/cmsaf.mit.edu/hibat/cms/users/davidlw/HYDJET_Minbias_4TeV_31X/gen/
* 100k production by Wei at CMSSW_3_1_X
Jpsi_pt_distribution
  |
| | 2nd HYDJET production information
* decache location : /pnfs/cmsaf.mit.edu/t2bat/cms/store/user/davidlw/HYDJET_GEN_X2_MB_4.0TeV/HYDJET_GEN_X2_MB_4.0TeV/545444c24aba01a433ce34e4c379212c/
* 100k production by Wei, including more quarkonia
Analysis of quarkonia with CMSSW at CMSSW_2_1_x |
|
<
< | - use 'HydQuarkoniaAnalyzer.cc' |
>
> | - use 'HydQuarkoniaAnalyzer.ccHydQuarkoniaAnalyzer.cc ' |
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1) pT distributions of J/psis
- the flat around 5 -10 GeV?/c doesn't feed down. This unexpected effect seems to be caused by the cases that the mother is J/psis themselves, chi_cs and color octet state.
It is neccessary to check generation situation.
Mothers of J/psi
| Mother (id) |
Number of production |
Status of Mother |
Status of J/psi |
Comment |
| None |
20 |
21 |
21 |
| J/psi (443) |
3992 |
21 |
11 |
|
| B0(+-511) |
3133(3096) |
11 or 12 |
11 |
|
| B+(+-521) |
3152(2927) |
11 |
11 |
|
| Bs0(+-531) |
885(884) |
11 |
11 |
|
| B_c(+-541) |
27(21) |
11 |
11 |
|
| chi_1c(20443) |
3848 |
11 |
11 |
|
| chi_2c(445) |
407 |
11 |
11 |
|
| chi_0c(10441) |
17 |
11 |
11 |
|
| Lambda_b0(+-5122) |
618(577) |
11 |
11 |
|
| Xi_b-(+-5132) |
23(19) |
11 |
11 |
|
| Xi_b0-(+-5132) |
24(15) |
11 |
11 |
|
| Omega_b-(5332) |
1 |
11 |
11 |
|
| Cluster(91) |
327 |
11 |
11 |
cluster fragmention (pQCD) |
| cc~(9900443) |
3375 |
11 |
11 |
Color Octet system |
| cc~(9910441) |
336 |
11 |
11 |
Color Octet system |
| cc~(9900441) |
261 |
11 |
11 |
Color Octet system |
| Total J/psi |
27985 |
|
|
|
- pT distribution of Upsilon from 100k hydjet minbias event.
Mothers of Upsilon
| Mother (id) |
Number of production |
Status of Mother |
Status of J/psi |
Comment |
| None |
34 |
21 |
21 |
| Upsilon (553) |
435 |
21 |
11 |
|
| Chi_0b (10551) |
8 |
11 |
11 |
|
| Chi_1b (20553) |
102 |
11 |
11 |
|
| Chi_2b (555) |
81 |
11 |
11 |
|
| bb bar 1s (9900551) |
32 |
11 |
11 |
Color Octet system |
| bb bar 3s (9900553) |
364 |
11 |
11 |
Color Octet system |
| bb bar 3p (9910551) |
5 |
11 |
11 |
Color Octet system |
| Cluster (91) |
328 |
11 |
11 |
cluster fragmention (pQCD) |
| Total Upsilon |
1084 |
|
|
|
2) pT distributions of muons from Kaons, B meson and J/psis
3) Dimuon mass continuum with muon combination
- use 'MuonCombiAnalyzer.cc'
- in order to look into clear signal, the study was done separately 0-1 GeV?/c^2, 2 - 4 GeV?/c^2, 0 - 10 GeV?/c^2.
Mass range 0 - 10 GeV?/c^2
Mass range 0 - 1 GeV?/c^2
Mass range 2 - 4 GeV?/c^2
-- DongHoMoon - 27 Apr 2009
| META FILEATTACHMENT |
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| META FILEATTACHMENT |
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| META FILEATTACHMENT |
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| META FILEATTACHMENT |
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| META FILEATTACHMENT |
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| META FILEATTACHMENT |
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| META FILEATTACHMENT |
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| META FILEATTACHMENT |
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| META FILEATTACHMENT |
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