Difference: HydjetComp (4 vs. 5)

Revision 52010-03-23 - MiheeJo

 
META TOPICPARENT name="MiheeJo"

2.76 TeV and 4 TeV Hydjet sample comparision

Introduction

Purpose of this study is to find out different characteristics of muon, J/psi and Upilon in the 4 TeV and 2.76 TeV Hydjet samples.

Data samples are located under MIT T2 servers. In the DBS, dataset name is :

  • 2.76 TeV (~ 1M events) : /Hydjet_Quenched_MinBias_2760GeV_MC_3XY_V24_GEN-SIM-RAW/davidlw-Hydjet_Quenched_MinBias_2760GeV_MC_3XY_V24_GEN-SIM-RAW-51550601a6965131c06787129d40c7a9/USER
  • 4 TeV (~ 35000 events) : /Hydjet_MinBias_4TeV/Summer09-MC_31X_V9-v1/GEN-SIM-RAW

Used program :

Issue on 2.8 TeV :

  • Number of muon per event is larger at 4 TeV and 2.76 TeV (~1/event) than at 2.8 TeV (~0.3/event).
  • Related material is on the indico : slide
  • pt hat hydjet cut in the samples (cut at 6 GeV/c for 2.8 TeV vs. 7 GeV/c in 4 TeV)

To do lists from HI di-lepton meeting:

  • Check what cross section is used for Pythia input in HYDJET and compare with NLO expectations (integrated numbers should be enough). The theoretical calculations should give a pt, eta distribution. One needs to compare the spectra from hydjet to the one from theory and see how well they match, in what region. Does the change in pt hat cut modify the muon pt specta (and those measurable) ?
  • Compare with HIJING (from Alice people) if the information is easy to access (but probably only at forward rapidity).

Mother particle comparsion

Comparision :
  • Transverse momentum (pt) trends are similar between 2.76 TeV and 4 TeV for same mom ID

Muon

pt_momid_mu_tot.png

List of all mother particle ID of muon

  • % is calculated by this formula
formula1.png

muon_momid.png

J/psi

pt_momid_jpsi_tot.png
Added:
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Because 4 TeV sample doesn't have enough J/psi, here is another plot from other 4 TeV sample. Original twiki site of this plot is here.

Jpsi_From_mother_dongho.png

 

List of all mother particle ID of J/psi

jpsi_momid.png

Upsilon

pt_momid_upsi_tot.png

Muon's rapidity, phi, pt distribution

  • Because number of total event for each sample is different, normalization is done by this formula
formula2.png

y_phi_pt_muon.png

J/psi's rapidity, phi, pt distribution

y_phi_pt_jpsi.png

Upsilon's rapidity, phi, pt distribution

y_phi_pt_upsi.png

-- MiheeJo - 21 Mar 2010

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