# 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

- 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 - 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)

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