May 15 – 20, 2017
Shanghai Jiao Tong University
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Measurements of photon identification efficiencies with the 2015 and 2016 pp collision data in ATLAS at √= 13 TeV

May 16, 2017, 2:00 PM
Haoran 102 (Shanghai Jiao Tong University)

Haoran 102

Shanghai Jiao Tong University

Xuhui Campus


Shuo Han (Chinese Academy of Sciences (CN))


This poster presents the techniques to measure the photon identification efficiencies in the ATLAS experiment, on the proton-proton collisions collected at √s = 13 TeV, with an integrated luminosity of 3.2 fb−1 and 33.3fb-1 corresponding to 2015 and 2016. Three independent analyses have been exploited. One uses photons from radiative Z→llγ decays. The second extracts the shower shape properties of electrons from Z→ee decays and extrapolates them to photons. The third directly measures the efficiency on samples of reconstructed photons, after determining and subtracting the hadronic background with a technique based on track isolation. The results from all analyses are then compared with each other and with the prediction from the simulation.

Primary author

Shuo Han (Chinese Academy of Sciences (CN))

Presentation materials