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D. Zhang (IPAS&USTC) & N. Panikashvili (UM)

Photon performance with early 7TeV data 1) photon performance (using f249 ): data/MinBias MC 2) comparison: data / MinBias MC / +jets MC. D. Zhang (IPAS&USTC) & N. Panikashvili (UM). Data / MC. Data: Run: (f249)153134, 153136, 153159, 153200 LHC stable beam Pixel SCT green

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D. Zhang (IPAS&USTC) & N. Panikashvili (UM)

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  1. Photon performance with early 7TeV data1) photon performance (using f249): data/MinBias MC2) comparison: data / MinBias MC / +jets MC D. Zhang (IPAS&USTC) & N. Panikashvili (UM)

  2. Data / MC • Data: • Run: (f249)153134, 153136, 153159, 153200 • LHC stable beam • Pixel SCT green • Same lumiblocks as e/ GRL • MC: • 105001, Pythia_Minbias • reconstruction tag r1210 (using DB release 9.6.1)

  3. Trigger: Require data and MC passing L1_MBTS_1_1 (require a 1-hit-coincidence) Primary vertices: select event with a good primary vertex which has at least 3 tracks Trigger & PV selection

  4. Object selection • electron: • Author 1 or 3 • isEM is tight • pT>5GeV, |η|<2.47 and exclude crack region [1.37, 1.52] • N of pixel hits >1, N of SCT hits > 6 • muon (Staco): • combined muon • pT> 5GeV, |η|<2.5 • N of pixel hits >1, N of SCT hits > 6 • photon: • pT(γ) >5GeV, |η|<2.37 and exclude crack region [1.37, 1.52] • ΔR > 0.2 between leptons and γ • isEM is loose, tight • jet: • AntiKt4H1Topo Jet • pT>20GeV, |η|<3.1 • remove jets overlapped with tight electron or tight photon in cone 0.4 • remove jets: jet N90 ≤ 2 & SamplingMax = 17

  5. Photon cut flow efficiency Overall efficiency Cut efficiency with respect to previous cut

  6. photon pT: all, Author = 4, Author = 16 Overlapremoval isEM - loose isEM - tight

  7. isEM - tight isEM - loose photon  all Author = 4 Author = 16

  8. events with loose photons Leading jet pT Jet pT Jet sum ET Jet multiplicity

  9. events with tight photons Leading jet pT Jet pT Jet sum ET Jet multiplicity

  10. MET/sumET isEM - loose isEM - tight

  11. events with loose photons Δφ(Leading photon, MET) Δφ (leading jet, MET) Meff

  12. events with tight photons Δφ(Leading photon, MET) Δφ (leading jet, MET) Meff

  13. Compare: • Data: integrated luminosity 347.1μb-1 • MinBias MC: (MinBias) = 48445 μb • +jets MC: (+jets) = 1.41 μb • Events requirement: • At least one jet with pT>20GeV • One loose/tight photon: pT>10GeV, ||<2.3

  14. events with loose/tight  and at least one jet isEM - loose isEM - tight

  15. events with tight  and at least one jet Leading jet pT Jet pT MET HT

  16. events with tight photons and one jet Δφ(photon, MET) Δφ (leading jet, MET) Δφ(photon, jet)

  17. Conclusions • Agreement (in shape of the distributions) between Data/MC • Continue check  performance with new runs • High fake photons rate in the low pT range

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