2008.05.09 Gamma-jet candidates pt-distributions and TPC tracking

Ilya Selyuzhenkov May 09, 2008

Detector eta cut study (1< eta < 1.4):

• For a three data samples (pp2006 [long], MC gamma-jet, and MC QCD background events)
  the EEMC detector eta cut of 1< eta < 1.4 has been applied.

• Although a poor statistics available for MC background QCD sample,
  the signal to background ratio (red to green line ratio)
  getting closer to 1:3 (expected signal to background ratio from Les study).

• Distributions withoud EEMC detector eta cut.

• y:x position within EEMC detector for gamma-jet candidates.

Figure 1:Gamma pt distribution. MC data are scaled to the same luminosity as data
(Normalization factor: Luminosity * sigma / N_events).

Figure 2:Gamma yield vs pt. MC data are scaled to the same luminosity as data.

Figure 3:Signal to background ratio (MC results are normalized to the data)