# 2009.10.13 Jason EEMC geometry: position correlations

### Effect of added layers in Jason geometry file (ecalgeo.g23)

Monte-Carlo setup:

- One photon per event
- EEMC only geometry with LOW_EM option
- 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

Added layer definition from Jason file:

- EXPS is the plastic
**spacer** in the shower maximum section
- EBLS is the layer of material on the
**back** (routing layers) of the SMD planes
- EFLS is the layer of material on the
**front** (G10, etc) of the SMD planes

Geometry configurations and notations (shown in the center of the plot):

**j-noLayers**: Jason geometry: no EXPS, EBLS, EFLS
**j-back**: Jason geometry, EBLS only
**j-front**: Jason geometry, EFLS only
**j-spacer**: Jason geometry, EXPS only
**j-all**: Jason geometry, all new layers included
**geom-cvs** geometry file from CVS after cAir bug fixed

cross section of 1st SMD plane labeled with "SUV" ordering

**Note**: u-v ordering scheme can be found here (Fig. 9-11)

**Figure 1:** Average number of SMD u-strip fired vs. thrown photon's (x,y)

**Figure 2:**Average number of SMD v-strip fired vs. thrown photon's (x,y)

**Figure 3:**Average SMD u-energy vs. thrown photon's (x,y)

**Figure 4:**Average SMD v-energy vs. thrown photon's (x,y)