Hydjet Validation for Dilepton Group Z0 Analysis

1. Previous Study

21XHYDJET 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 at CMSSW_2_1_X

Jpsi And Muon pt distribution

• Note : This result includes double counting in the J/psis and muons, which means that some of particles decayed several times as themselves.

2. Quarkonia on 2.76 TeV Hydjet Samples (Quarkonia and Weak bosons off , done by Mihee)

• 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

Jpsi And Muon pt distribution

3. Quarkonia on 2.76 TeV Hydjet Samples (Quarkonia and Weak bosons on)

• /castor/cern.ch/user/d/dmoon/cms352/HydjetMinBias_2.76_QWon6

• /afs/cern.ch/user/d/dmoon/public/html/HydjetValidation/Hydjet_MinBias_2.76TeV_QWon6_cfg.py

Jpsi And Muon pt distribution

The conclusion

• They are not much different, because they are using MSEL = 1, we need to change this parameter.
• old default setting, including quarkonia setup is here

• in ppdfault MSEL should be changed from 1 to 0.

     * parameterSets = cms.vstring(
              'ppDefault',
              'pythiaUESettings',
              'pythiaJets', 
              'pythiaZjets',
              'pythiaPromptPhotons', 
              'pythiaWeakBosons', 
              'pythiaCharmoniumNRQCD', 
              'pythiaBottomoniumNRQCD', 
              'pythiaQuarkoniaSettings')
  
       

• have a look at here, if you want take this setting

4. Quarkonia on 2.76 TeV Hydjet Samples (Quarkonia and Weak bosons on with NEW SETTING)

General Information of Hydjet Production

Jpsi And Muon pt distribution

Muon's mother llist of Hydjet

• Name (pdgId) : number of particles
• D meson family (411, 431, 421) : 64461
• B meson family (521, 511, 531, 541) : 11031
• eta (221) : 4972
• rho (113) : 1314
• lambda family (4122, 5122) : 3237
• Quarkonia (J/psi(443), Upsilon(553)) : 206, 4
• tau - (15) : 973
• phi (333) : 520
• Xi family (4132, 4232, 5232, 5132) : 705
• No Kaon, Pion

J/psi cross section by pythia6

Muon ratio comparison (|eta| < 2.4)/(No eta cut) between 4 GeV?/c and 6 GeV?/c

-- DongHoMoon - 06 Apr 2010