Ilya Selyuzhenkov January 27, 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 or no pt cuts
• L2gamma emulation in Monte-Carlo
• L2gamma triggered pp2006 events
• cos (phi_jet - phi_gamma) < -0.8
• |eta_jet|< 0.7
• |v_z| < 100

Figures

All figures:

• All pre-shower conditions combined, pre1<10MeV
• Left plots: no gamma pt cut
  Right plots: pt_gamma >7GeV
• Thick blue line shows MC sum: QCD + gamma-jet
• Thin solid color lines shows distributions from various partonic pt bins for QCD MC
  See figures legend for color coding

Figure 1: Vertex z distribution

Figure 2: Photon eta

Figure 3: Away side jet eta

Figure 4:Photon pt

Same as in Fig.4 on a log scale: no gamma pt cut and pt>7GeV

Figure 5: Away side jet pt

Same as in Fig.5 on a log scale: no gamma pt cut and pt>7GeV