2010.01.07 EEMC response to single photons with y2006h vs y2009a geometries

Monte-Carlo setup

• Throwing one photon per event
• Full STAR y2006h/y2009a configurations
• Throw particles flat in eta (1.08, 2.0), phi (0, 2pi), and energy (5-35 GeV)
• Using A2Emaker to get reconstructed Tower/SMD energy (no EEMC SlowSimulator in chain)
• Vertex z=0
• ~50K/per particle type
• Non-zero energy: 3 sigma above pedestal

Geometry configurations:

• y6h:10KeV (black) - y2006h with emc_10KeV
• y9a:10KeV (red) - y2009a with emc_10KeV

STAR geometry includes the latest "15Deg rotated volume" bug bug fix

Figure 1: EEMC sampling fraction
(left) vs. thrown photon energy (with 1.2 < eta < 1.9 cut)
(right) vs. thrown photon eta

Figure 2: 2x1/3x3 clustering

Figure 3: Shower shapes (u plane)

Figure 4: Shower shape ratios (u plane)

Figure 5: Pre-shower migration (1.2 < eta < 1.9)

Figure 6: Average pre-shower1 energy vs. thown photon position in EEMC
(left) y2009a with emc_10KeV
(right) y2006h with emc_10KeV