2008.04.12 Pythia Gamma-Jets
Pythia Gamma-Jets
Gamma-Jet Yields
During Run 6, the L2-gamma trigger (trigger id 137641) sampled 4717.10 nb-1 of integrated luminosity. By restricting the jet to the Barrel, |ηjet|<1, and the gamma to the Endcap, 1<ηgamma<2, the yield of gamma-jets is estimated as the product of the luminosity, the cross section, and the fraction of events in the phasespace above. The total cross section reported by Pythia for gamma-jet processes at different partonic pT thresholds is listed in the table below. No efficiencies are included.
| pT threshold [GeV] | Total cross section [mb] | Fraction | Ngamma-jets |
| 5 | 6.551E-05 | 0.0992 | 30654 |
| 6 | 3.075E-05 | 0.1161 | 16840 |
| 7 | 1.567E-05 | 0.1150 | 8500 |
| 8 | 8.654E-06 | 0.1131 | 4617 |
| 9 | 4.971E-06 | 0.1223 | 2868 |
| 10 | 2.953E-06 | 0.1151 | 1603 |
Gamma-Jets pT slope
The pT slope is exp(-0.69*pT)=2^(-pT), so the statistics are halved with each 1 GeV increase in pT.
References
- Yield estimates based on single-particle MC sample, and comparison w/ pythia (Jason Webb)
- Pythia estimates of gamma-jet yields (Jim Sowinski)
Pibero Djawotho Last updated Sat Apr 12 15:15:56 EDT 2008