2009.11.03 Jason EEMC geometry: Effect of ELED block change

Monte-Carlo setup:

• One photon per event
• Disabled SMD layers (EXPS EBLS EFLS) in Jason geometry
• Alter the ELED block (lead absorber plate) in Jason geometry file
• Full STAR geometry configurations with and without LOW_EM option
  (using Victor's geometry fix)
• Throw particles flat in eta (1.08, 2.0), phi (0, 2pi), and pt (6-10 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

Figure 1: Sampling fraction (total energy in EEMC)

• Solid symbols and lines present results with LOW_EM option
  Note: the black are the same in left and right plots
• Open/dashed symbols and lines - results without LOW_EM option
• Upper plots - distribution of the sampling fcation
• Lower plots - Sampling fcation vs. thrown photon energy

1. Left plots: CVS geometry vs. Jason with removed extra SMD layers.
   ELED block is the same in all 4 cases, and is taken from CVS file.
   in red: CVS geometry, in black - Jason geometry
2. Right plots:
   Jason with new ELED block (in red) vs. Jason with ELED block from CVS (in black)
   Extra SMD layers are removed in all 4 cases

Figure 2: Sampling fraction (total energy in EEMC)
black: same black as in Fig. 1, upper plots
red: EEMC geometry with Material PbAlloy isvol=0
(modification suggested by Jason in this post)