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Study of Photon Isolation Efficiency from Electron Sample in Z->ee Decay at University of Oxford

This study investigates the photon isolation efficiency derived from an electron sample from the Z->ee decay process, conducted by Zhijun Liang at the University of Oxford. We define isolation criteria and implement leakage and ambient energy corrections. Our selection cuts focus on tight electrons with specific kinematic requirements. We analyze systematic uncertainties related to in-time and out-of-time pileup, as well as pT dependencies, seeking to address discrepancies between electron and photon isolation shapes. This report outlines current progress and plans for final results.

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Study of Photon Isolation Efficiency from Electron Sample in Z->ee Decay at University of Oxford

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  1. Photon isolation efficiency study Zhijun Liang University of Oxford

  2. Introduction • Motivation : • Estimate photon isolation efficiency from electron sample from Z->ee • Isolation defintion: • Leakage correction • Ambiant energy correction • Selection cut : • Period D~H, EF_e20_medium, Egamma stream • Two opp charge , tight electron , pT>25GeV , eta cut • 85Gev<M(ee)<95Gev • Systematic : • In-time pileup uncertainty • Out-of-time pileup uncertainty • pT dependence • Discrepancy between electron isolation shape and photon isolation shape

  3. In-time pileup uncertainty(1fb-1 data) Etcone30_corr[GeV] Etcone40_corr[GeV] npV<3 3<=npV<=4 5<=npV<=6 Npv>=7 Etcone20_corr[GeV]

  4. Photon isolation efficiency in different NPV bins(1fb-1 data) Etcone30_corr[GeV] Etcone40_corr[GeV] npV<3 3<=npV<=4 5<=npV<=6 Npv>=7 Etcone20_corr[GeV]

  5. Out of time pileup effect(1fb-1 data) (bunch position dependence) Etcone30_corr[GeV] Etcone40_corr[GeV] Bunch position <=3 4<=Bunch position <=6 7<=Bunch position <=9 Bunch position >9 Etcone20_corr[GeV]

  6. Out of time pileup effect(1fb-1 data) (bunch position dependence) Etcone30_corr[GeV] Etcone40_corr[GeV] Bunch position <=3 4<=Bunch position <=6 7<=Bunch position <=9 Bunch position >9 Etcone20_corr[GeV]

  7. pT dependence effect(1fb-1 data) Etcone30_corr[GeV] Etcone40_corr[GeV] Pt<35GeV 35GeV<=pT<=40GeV 40GeV<=pT <=45GeV pT>45GeV Etcone20_corr[GeV]

  8. pT dependence effect(1fb-1 data) Etcone30_corr[GeV] Etcone40_corr[GeV] Pt<35GeV 35GeV<=pT<=40GeV 40GeV<=pT <=45GeV pT>45GeV Etcone20_corr[GeV]

  9. Discrepancy between electron and photon Etcone30_corr[GeV] Etcone40_corr[GeV] Unconverted photon from Z->ee+gamma Converted photon from Z->ee+gamma Electron isolation from Z->ee Etcone20_corr[GeV]

  10. Summary • Working progress report . • Plan for Final result and systematic: • In-time pileup uncertainty • Out-of-time pileup uncertainty • pT dependence • Discrepancy between electron isolation shape and photon isolation shape

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