Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 16: Experimental Methods (general) 1

T 16.9: Vortrag

Montag, 21. März 2022, 18:15–18:30, T-H29

Electron reconstruction and identification with the ATLAS detector — •Asma Hadef and Lucia Masetti — Johannes Gutenberg Universität, Mainz, Germany

Electrons are important objects both for the search for new physics and for precision measurements. In the ATLAS detector, electrons in the central detector region are triggered by and reconstructed from energy deposits in the electromagnetic (EM) calorimeter that are matched to a track in the inner detector. Electrons are distinguished from other particles using identification (ID) criteria with different levels of background rejection and signal efficiency. The electron ID used in ATLAS for Run 2 is based on a likelihood discrimination to separate isolated electron candidates from candidates originating from photon conversions, hadron misidentification and heavy flavor decays. The performance of the electron reconstruction and ID algorithms is evaluated by measuring efficiencies using tag-and-probe techniques with large statistics samples of isolated electrons from Z→ee and J/ψ→ee resonance decays. These measurements were performed with pp collisions data at √s =13 TeV in 2015-2018 corresponding to an integrated luminosity of 139 fb⁻¹ and studied as a function of the electron’s transverse momentum, pseudorapidity and number of primary vertices. Furthermore, in order to achieve reliable physics results, the simulated samples need to be corrected to reproduce the measured data efficiencies as closely as possible. For this reason, the efficiencies are estimated both in data and in simulation. The scale factors (data to MC efficiency ratios) are then estimated and provided to all physics analyses involving electrons.