Standard Photon ID performance in GMSB susy samples Helen Hayward University of Liverpool.
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Standard Photon ID performance in GMSB susy samples Helen Hayward University of Liverpool
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Transcript of Standard Photon ID performance in GMSB susy samples Helen Hayward University of Liverpool.
Standard Photon ID performance in GMSB susy samples
Helen Hayward
University of Liverpool
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.
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
Photon efficiencies (cuts applied sequentially)
GMSB1 GMSB2 GMSB3
isEM&0x2 (hadronic leakage)
0.92 0.92 0.92
isEM&0x4 (2nd sampling)
0.72 0.59 0.55
isEM&0x8(1st sampling)
0.60 0.44 0.41
