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Jet Reco

Jet Reco. Andy Yen. Intro. Superstrings can lead to the following non-SM process: gg→gγ Extra contribution to the SM gamma+jet. 2. Data Samples. Photon + Jet Ckin(3) > 170 GeV Summer08 Official Production, CMSSW 2.2.x Private Production, CMSSW 3.2.1 On Gen Level, the samples agree

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Jet Reco

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  1. Jet Reco Andy Yen

  2. Intro • Superstrings can lead to the following non-SM process: gg→gγ • Extra contribution to the SM gamma+jet. 2

  3. Data Samples • Photon + Jet • Ckin(3) > 170 GeV • Summer08 Official Production, CMSSW 2.2.x • Private Production, CMSSW 3.2.1 • On Gen Level, the samples agree • Photon Pt ~200 GeV • Jet Pt ~ 200 GeV • Jets Objects used • iterativeCone5CaloJet • sisCone5PFJet 3

  4. Jet Algorithms • iterativeCone algorithm • Colinear unsafe • Infrared unsafe • sisCone algorithm • “seedless infrared safe cone” • Particle Flow • Reconstruct ALL particles in event • Uses all CMS subdetectors • Performance similar to JPT energy corrections. 4

  5. Efficiencies • In detector: photon+jet eta <2.5 • Highest Pt Jet and Photon Candidate in event selected. • MC jet taken to be outgoing quark or gluon • Efficiencies calculated by matching Jet/Photon Candidate with MC Jet/Photon • Photon matching req: dR<0.15 • Jet matching req: dR<0.5 5

  6. Jet Energy Response • CMSSW 3.2.1 • IterativeCone5CaloJets vs sisCone5PFJets • Crystal Ball Fit with 2 polynomial tails Mean: 0.77 Sigma: .123 Mean: 0.94 Sigma: .082 6

  7. Jet Response (continued) • iterativeCone5CaloJets • CMSSW 2.2.x vs 3.2.1 • Arbitrary normalization Mean: 0.79 Sigma: .106 Mean: 0.77 Sigma: .123 7

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