2009.02.09 pp2006, pp2008, amd mc2006 comparison
Ilya Selyuzhenkov February 06, 2009
Data sets
Cuts applied
- Di-jet events
- Require to reconstruct photon momentum (no gamma-jet isolation cuts)
- Gamma pt > 7GeV, jet pt > 7GeV
- L2gamma emulation in Monte-Carlo
- L2gamma triggered for pp2006 and pp2008 events
- cos (phi_jet - phi_gamma) < -0.8
- detector |eta_jet|< 0.8
- |v_z| < 100
Figures
Each figure has:
- All pre-shower conditions combined, No pre-shower cuts
- Red circles show pp2006 data
- Black triangles show pp2008 data
Data scaled to match the integraled yield from pp2006 data
- Green line shows MC sum: QCD + gamma-jet
Monte-Carlo results for QCD and gamma-jet samples are first
scaled to 3.164 pb^-1 according to Pythia luminosity,
added together, and then an additional fudge factor of 1.24 applied.
Fudge factor is defined as pp2006 to Monte-Carlo sum ratio
for pt_jet>7GeV and pt_gamma>7 candidates
Kinematics
Figure 1: vertex z
![](/STAR/files/userfiles/133/image/20090209/20090209__20090204_jPtGt7_pt1gt7pt2gt7_counts_vertexZ_dataMCsum_1D.png)
Figure 2: photon detector eta
![](/STAR/files/userfiles/133/image/20090209/20090209__20090204_jPtGt7_pt1gt7pt2gt7_counts_etaGammaDet_dataMCsum_1D.png)
Figure 3: jet detector eta
![](/STAR/files/userfiles/133/image/20090209/20090209__20090204_jPtGt7_pt1gt7pt2gt7_counts_etaDetJet2_dataMCsum_1D.png)
Figure 4: photon pt
![](/STAR/files/userfiles/133/image/20090209/20090209__20090204_jPtGt7_pt1gt7pt2gt7_counts_ptGamma_dataMCsum_1D.png)
Figure 5: jet pt
![](/STAR/files/userfiles/133/image/20090209/20090209__20090204_jPtGt7_pt1gt7pt2gt7_counts_ptJet2_dataMCsum_1D.png)
Figure 6: gamma-jet pt balance
![](/STAR/files/userfiles/133/image/20090209/20090209__20090204_jPtGt7_pt1gt7pt2gt7_counts_ptDeltaGammaJet2_dataMCsum_1D.png)
Figure 7: Photon neutral energy fraction
![](/STAR/files/userfiles/133/image/20090209/20090209__20090204_jPtGt7_pt1gt7pt2gt7_counts_RemJet1_dataMCsum_1D.png)
Figure 8: Jet neutral energy fraction
![](/STAR/files/userfiles/133/image/20090209/20090209__20090204_jPtGt7_pt1gt7pt2gt7_counts_RemJet2_dataMCsum_1D.png)
Figure 9: cos(phi_gamma-phi_jet)
![](/STAR/files/userfiles/133/image/20090209/20090209__20090204_jPtGt7_pt1gt7pt2gt7_counts_cosPhiGammaPhiJet_dataMCsum_1D.png)
Photon candidate's 2x1, 2x2, and 3x3 tower cluser energy
Figure 10: 3x3 cluster energy
![](/STAR/files/userfiles/133/image/20090209/20090209__20090204_jPtGt7_pt1gt7pt2gt7_counts_energy3x3Tower_dataMCsum_1D.png)
Figure 11: 2x1 cluster energy
![](/STAR/files/userfiles/133/image/20090209/20090209__20090204_jPtGt7_pt1gt7pt2gt7_counts_energyTower2x1_dataMCsum_1D.png)
Figure 12: 2x2 cluster energy
![](/STAR/files/userfiles/133/image/20090209/20090209__20090204_jPtGt7_pt1gt7pt2gt7_counts_energyTower2x2_dataMCsum_1D.png)
Number of charge tracks, Barrel and Endcap towers within r=0.7 for photon and gamma
Figure 13: Number of charged track associated with photon candidate
![](/STAR/files/userfiles/133/image/20090209/20090209__20090204_jPtGt7_pt1gt7pt2gt7_counts_nChargeGamma_dataMCsum_1D.png)
Figure 14: Number of Barrel towers associated with photon candidate
![](/STAR/files/userfiles/133/image/20090209/20090209__20090204_jPtGt7_pt1gt7pt2gt7_counts_nBarrelTowerGamma_dataMCsum_1D.png)
Figure 15: Number of Endcap towers associated with photon candidate
![](/STAR/files/userfiles/133/image/20090209/20090209__20090204_jPtGt7_pt1gt7pt2gt7_counts_nEndcapTowerGamma_dataMCsum_1D.png)
Jet energy composition
Figure 16: Jet energy part from Barrel towers
![](/STAR/files/userfiles/133/image/20090209/20090209__20090204_jPtGt7_pt1gt7pt2gt7_counts_energyBtowJet2_dataMCsum_1D.png)
Figure 17: Jet energy part from charge tracks
![](/STAR/files/userfiles/133/image/20090209/20090209__20090204_jPtGt7_pt1gt7pt2gt7_counts_energyChargeJet2_dataMCsum_1D.png)