Ilya Selyuzhenkov February 03, 2009

Data sets

• pp2006 - STAR 2006 pp longitudinal data (~ 3.164 pb^1)
  Trigger: eemc-http-mb-L2gamma [id:137641]
• gamma-jet[gamma-filtered] - data-driven Prompt Photon [p6410EemcGammaFilter] events.
  Partonic pt range 2-25 GeV.
• QCD jets[gamma-filtered] - data-driven QCD [p6410EemcGammaFilter] events.
  Partonic pt range 2-25 GeV.

Cuts applied

• Di-jet events
• Require to reconstruct photon momentum (no gamma-jet isolation cuts)
• Gamma pt > 7GeV
• L2gamma emulation in Monte-Carlo
• L2gamma triggered pp2006 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
• Thick blue line shows MC sum: QCD + gamma-jet
• Black solid circles shows pp2006 data
• Left plots: pt_jet>7GeV
  Right plots: no cuts on pt_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

Figure 1: Vertex z distribution

Figure 2: Photon detector eta

Figure 3: Corrected for vetrex photon eta

Figure 4: Away side jet detector eta

Figure 5: Corrected for vetrex away side jet eta

Figure 6:Photon pt

Figure 7: Away side jet pt

Figure 8: Pre-shower 1 energy

Figure 9: Pre-shower 2 energy