10 - H1 - Desy
10 - H1 - Desy
10 - H1 - Desy
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72 Prompt photon selection<br />
Selection Cut N data Signal eff.<br />
HERA II data 550 × <strong>10</strong> 6 <strong>10</strong>0%<br />
Online selection (A) 65 × <strong>10</strong> 6 82%<br />
s67 subtrigger<br />
Electron-proton interaction selection (B) 2.6 × <strong>10</strong> 6 76%<br />
Run Quality medium or good<br />
Essential subdetectors HV<br />
LAr calorimeter and CJC timing<br />
|z vtx | < 35 cm<br />
Topological background finders veto<br />
0.05 < y < 0.85<br />
Ntracks cent Photoproduction selection (C) 2.0 × <strong>10</strong> 6 73%<br />
SPACAL electron veto<br />
LAr calorimeter electron veto<br />
0.1 < y < 0.7<br />
Photon kinematics selection (D) 625 × <strong>10</strong> 3 70%<br />
5.7 < E γ T<br />
< 17 GeV<br />
−1.1 < η γ < 2.5<br />
Cluster quality criteria (E) 420 × <strong>10</strong> 3 50%<br />
E γ EM2 > f(θ)<br />
LAr calorimeter fiducial cuts<br />
LAr calorimeter φ and z cracks proximity<br />
Wheel unambiguity<br />
BT matching<br />
Charged particles veto criteria (F) 67 × <strong>10</strong> 3 39%<br />
Nlayers CIP DCA track > 15 cm (for θ γ > 45 ◦ )<br />
Neutral hadron suppresion criteria (G) 15043 30%<br />
z > 0.9<br />
R T < 6 cm<br />
M γγ > 0.3 MeV<br />
Cells spread<br />
Only one photon candidate<br />
Accompanying jet selection (H) 8836<br />
E jet<br />
T<br />
> 4.5 GeV<br />
−1.3 < η jet < 2.3<br />
Event class selection (I) 3058<br />
x LO<br />
γ > 0.8 (x LO<br />
γ < 0.8) (5778)<br />
Direct (Resolved) Enhanced Selection<br />
Exclusive Selection<br />
Inclusive Selection<br />
Table 5.1: Prompt photon selection summary.
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