1. Standard Photon ID performance in GMSB susy samples Helen Hayward University of Liverpool

2. Samples used Data samples: –GMSB1: shortlived neutralino-> standard pointing photons –GMSB2: Cgrav30 (non-pointing photons) –GMSB3: Cgrav55(non-pointing photons) –Background: JF17 is used. An eta cut of 2, pt cut of 20 GeV has been applied Using truth information to make sure I am only looking at photons whose parent is a susy particle.

4. Photon selection cuts. Corrected width in 3 strips Fraction of energy in strips Energy in strips outside core Corrected width in 3x5 cells in middle Total width using 40 strips

5. Photon efficiencies (cuts applied sequentially) GMSB1GMSB2GMSB3 isEM&0x2 (hadronic leakage) 0.92 isEM&0x4 (2nd sampling) 0.720.590.55 isEM&0x8(1st sampling) 0.600.440.41