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Electron and photon efficiencies in LHC Run 2 with the ATLAS experiment

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Aad, G 
Abbott, B 
Abeling, K 
Abicht, NJ 
Abidi, SH 


jats:titleAjats:scbstract</jats:sc> </jats:title>jats:pPrecision measurements of electron reconstruction, identification, and isolation efficiencies and photon identification efficiencies are presented. They use the full Run 2 data sample collected by the ATLAS experiment in jats:italicpp</jats:italic> collisions at a centre-of-mass energy of 13 TeV during the years 2015–2018, corresponding to an integrated luminosity of 139 fbjats:supjats:italic−</jats:italic>1</jats:sup>. The measured electron identification efficiencies have uncertainties that are around 30%–50% smaller than the previous Run 2 results due to an improved methodology and the inclusion of more data. A better pile-up subtraction method leads to electron isolation efficiencies that are more independent of the amount of pile-up activity. Updated photon identification efficiencies are also presented, using the full Run 2 data. When compared to the previous measurement, a 30%–40% smaller uncertainty is observed on the photon identification efficiencies, thanks to the increased amount of available data.</jats:p>



5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences

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Journal of High Energy Physics

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Springer Science and Business Media LLC