# 2009.09.04 Test of corrected EEMC geometry: SVT, slow-simulator on/off, pre-shower migration

### Test of corrected EEMC geometry: shower shapes (bug 1618)

Monte-Carlo setup:

- One particle per event (photons, electrons, pions, and eta-meson)
- Full STAR 2006 geometry
**(with/without SVT)**

In Kumac file: detp geom y2006g; gexec $STAR_LIB/geometry.so (remove SVT with SVTT_OFF 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

(**with/without EEMC SlowSimulator in chain**) - Vertex z=0
- ~50K/per particle type
- Non-zero energy: 3 sigma above pedestal

Color coding:

**Photon**(single particle MC)**Electron**(single particle MC)**Neutral pion**(single particle MC)**Eta-meson**(single particle MC)**Eta-meson [pp2006 data]**(single photons from eta-meson decay)

Pre-shower bins:

- Ep1 = 0, Ep2 = 0 (no energy in both EEMC pre-shower layers)
- Ep1 = 0, Ep2 > 0
- 0 < Ep1 < 4 MeV
- 4 < Ep1 < 10 MeV
- Ep1 > 10 MeV
- All pre-shower bins combined

Ep1/Ep2 is the energy deposited in the 1st/2nd EEMC pre-shower layer.

For a single particle MC it is a sum over

all pre-shower tiles in the EEMC with energy of 3 sigma above pedestal.

For eta-meson from pp2006 data the sum is over 3x3 tower patch

### Shower shapes

Single particle kinematic cuts: pt=7-8GeV, eta=1.2-1.4

Eta-meson shower shapes (blue) taken from Fig. 1 from here of this post

All shapes are normalized to 1 at peak (central strip)

**Figure 1:** Shower shape sorted by pre-shower conditions.

cAir-Fixed EEMC geometry **(NO slow simulator, WITH SVT)**

Ratio plot

**Figure 2:** Shower shape sorted by pre-shower conditions.

cAir-Fixed EEMC geometry **(NO slow simulator, NO SVT)**

Ratio plot

**Figure 3:** Shower shape sorted by pre-shower conditions.

cAir-Fixed EEMC geometry **(WITH slow simulator, WITH SVT)**

Ratio plot

**Figure 4:** Shower shape sorted by pre-shower conditions.

**Old cAir-bug EEMC geometry (NO slow simulator, WITH SVT)**

Click here to see the plot

### Pre-shower migration with/without SVT

Starting with a fixed (50K events) for each type of particle.

Change in number of counts for a given pre-shower bin

with different detector configuration shows pre-shower migration

**Figure 5:** Pre-shower migration.

cAir-Fixed EEMC geometry **(WITH SVT)**

**Figure 6:** Pre-shower migration.

cAir-Fixed EEMC geometry **(WITHOUT SVT)**

### Sampling fraction with/without Slow-simulator

**Figure 7:** Sampling fraction (0.05 E_reco / E_thrown).

cAir-Fixed EEMC geometry **(WITHOUT Slow-simulator)**

**Figure 8:** Sampling fraction (0.05 E_reco / E_thrown).

cAir-Fixed EEMC geometry **(WITH Slow-simulator)**

Slow simulator introduce some non-linearity in the sampling fraction

**Figure 9:** Sampling fraction (0.05 E_reco / E_thrown).

cAir-Fixed EEMC geometry **(WITHOUT SVT, WITHOUT Slow-simulator)**

Click here to see the plot

**Figure 10:** Sampling fraction (0.05 E_reco / E_thrown).

Old cAir-bug EEMC geometry **(NO slow simulator, WITH SVT)**

Click here to see the plot

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