# 2008.03.26 Sided residual and chi2 distribution for gamma-jet candidates (pre1,2 sorted)

Ilya Selyuzhenkov *March 26, 2008*

### gamma-jet candidates (no pt cut)

**Definitions:**

**F_peak**- integral for a fit within [-2,2] strips around SMD u/v peak**D_peak**- integral over the data within [-2,2] strips around SMD u/v peak**D_tail^max (D_tail^min)**- maximum (minimum) integral over the data tail within +-[3,30] strips from a SMD u/v peak**F_tail**is the integral over the fit tail within [3,30] strips from a SMD u/v peak.**Maximum residual = D_tail^max - F_tail**

All results are for combined distributions from u and v planes: ([u]+[v])/2

Gamma-jet isolation cuts described here

Additional quality cuts:

- Matching between 3x3 tower cluster and u-v high strip intersection
- At least 4 strips fired within [-2,2] strips from a peak

**Figure 1:** **F_peak** vs **maximum residual**

for various cuts on energy deposited in the EEMC pre-shower 1 and 2

(within a 3x3 clusters around tower with a maximum energy).

**Figure 2:** **F_data** vs **D_tail^max**

**Note:**This plot is fit independend (only the peak position is defined based on the fit)

**Figure 3:** **F_data** vs **D_tail^max-D_tail^max**

**Figure 4:** Gamma transverse momentum vs jet transverse momentum

### gamma-jet candidates: pt > 7GeV

**Figure 5:** **F_peak** vs **maximum residual**

for various cuts on energy deposited in the EEMC pre-shower 1 and 2

(within a 3x3 clusters around tower with a maximum energy).

**Figure 6:** **F_data** vs **D_tail^max**

**Note:**This plot is fit independend (only the peak position is defined based on the fit)

**Figure 7:** **F_data** vs **D_tail^max-D_tail^max**

**Figure 8:** Gamma transverse momentum vs jet transverse momentum

### gamma-jet candidates: eta, phi, and max[u,v] strip distributions (no pt cuts)

**Figure 9:** Gamma pseudorapidity vs jet pseudorapidity

**Figure 10:** Gamma azimuthal angle vs jet azimuthal angle

**Note:** for the case of Pre1>1 && Pre2==0 there is an enhancement around phi_gamma = 0?

**Figure 11:** maximum strip in v-plane vs maximum strip in u-plane

### Chi2 distribution for gamma-jet candidates (no pt cuts)

**Figure 12:**Chi2/ndf for gamma-jet candidates using Monte Carlo shape (combined for [u+v]/2 plane )

**Figure 13:**Chi2/ndf for gamma-jet candidates (combined for [u+v]/2 plane ) using Will's shape

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