# 2008.06.10 Gamma-jet candidate longitudinal double spin asymmetry

Ilya Selyuzhenkov *June 10, 2008*

**Note:** No background subtraction has been done yet

The case of pre-shower1=0 (left plots) roughly has 1:1 signal to background ratio,

while pre-shower1>0 (right plots) have 1:10 ratio (See MC to data comparison for details).

Data sets:

**pp2006**- STAR 2006 pp longitudinal data (~ 3.164 pb^1) after applying gamma-jet isolation cuts,

plus two additional vertex QA cuts:

a) |z_vertex| < 100 and

b) 180 < bbcTimeBin < 300- Polarization fill by fill: blue and yellow
- Relative luminosity by polarization fills and runs: relLumi06_070614.txt.gz
**Equations used to calculate A_LL from the data**: pdf file

**Figure 1:** Gamma-jet candidate A_LL vs gamma pt.

Figures for related epsilon_LL and 1/Lum scaled by a factor 10^7

(see pdf/html links above for epsilon_LL and 1/Lum definitions)

**Figure 2:** Gamma-jet candidate A_LL vs x_gluon.

Figures for related epsilon_LL and 1/Lum scaled by a factor 10^7

**Figure 3:** Gamma-jet candidate A_LL vs x_quark.

Figures for related epsilon_LL and 1/Lum scaled by a factor 10^7

**Figure 4:** Gamma-jet candidate A_LL vs away side jet pt.

Figures for related epsilon_LL and 1/Lum scaled by a factor 10^7

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