Photon isolation efficiency study
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![Page 1: Photon isolation efficiency study](https://reader030.fdocuments.us/reader030/viewer/2022032607/56812fbf550346895d9541c4/html5/thumbnails/1.jpg)
Zhijun Liang University of Oxford
Photon isolation efficiency study
![Page 2: Photon isolation efficiency study](https://reader030.fdocuments.us/reader030/viewer/2022032607/56812fbf550346895d9541c4/html5/thumbnails/2.jpg)
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
![Page 3: Photon isolation efficiency study](https://reader030.fdocuments.us/reader030/viewer/2022032607/56812fbf550346895d9541c4/html5/thumbnails/3.jpg)
In-time pileup uncertainty(1fb-1 data)
Etcone40_corr[GeV] Etcone30_corr[GeV]
Etcone20_corr[GeV]
npV<33<=npV<=45<=npV<=6Npv>=7
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Photon isolation efficiency in different NPV bins(1fb-1 data)
Etcone40_corr[GeV] Etcone30_corr[GeV]
Etcone20_corr[GeV]
npV<33<=npV<=45<=npV<=6Npv>=7
![Page 5: Photon isolation efficiency study](https://reader030.fdocuments.us/reader030/viewer/2022032607/56812fbf550346895d9541c4/html5/thumbnails/5.jpg)
Out of time pileup effect(1fb-1 data) (bunch position dependence)
Bunch position <=34<=Bunch position <=67<=Bunch position <=9Bunch position >9
Etcone40_corr[GeV] Etcone30_corr[GeV]
Etcone20_corr[GeV]
![Page 6: Photon isolation efficiency study](https://reader030.fdocuments.us/reader030/viewer/2022032607/56812fbf550346895d9541c4/html5/thumbnails/6.jpg)
Out of time pileup effect(1fb-1 data) (bunch position dependence)
Bunch position <=34<=Bunch position <=67<=Bunch position <=9Bunch position >9
Etcone40_corr[GeV] Etcone30_corr[GeV]
Etcone20_corr[GeV]
![Page 7: Photon isolation efficiency study](https://reader030.fdocuments.us/reader030/viewer/2022032607/56812fbf550346895d9541c4/html5/thumbnails/7.jpg)
pT dependence effect(1fb-1 data)
Etcone40_corr[GeV] Etcone30_corr[GeV]
Etcone20_corr[GeV]
Pt<35GeV35GeV<=pT<=40GeV40GeV<=pT <=45GeVpT>45GeV
![Page 8: Photon isolation efficiency study](https://reader030.fdocuments.us/reader030/viewer/2022032607/56812fbf550346895d9541c4/html5/thumbnails/8.jpg)
pT dependence effect(1fb-1 data)
Etcone40_corr[GeV] Etcone30_corr[GeV]
Etcone20_corr[GeV]
Pt<35GeV35GeV<=pT<=40GeV40GeV<=pT <=45GeVpT>45GeV
![Page 9: Photon isolation efficiency study](https://reader030.fdocuments.us/reader030/viewer/2022032607/56812fbf550346895d9541c4/html5/thumbnails/9.jpg)
Discrepancy between electron and photon
Unconverted photon from Z->ee+gammaConverted photon from Z->ee+gammaElectron isolation from Z->ee
Etcone40_corr[GeV] Etcone30_corr[GeV]
Etcone20_corr[GeV]
![Page 10: Photon isolation efficiency study](https://reader030.fdocuments.us/reader030/viewer/2022032607/56812fbf550346895d9541c4/html5/thumbnails/10.jpg)
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