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T: Fachverband Teilchenphysik

T 74: Experimentelle Methoden II

T 74.2: Talk

Wednesday, March 2, 2016, 17:00–17:15, VMP8 SR 105

Studies of the misidentification probability of electrons as photons at √s=13   TeV with the CMS experiment — •Ralf Meyer, Lutz Feld, and Maximilian Knut Kiesel — 1. Physikalisches Institut B, RWTH Aachen University

In high energy proton-proton collisions, several processes lead to final states containing at least one photon. These are of particular interest in many analyses, for example searches for physics beyond the Standard Model. A possible source of backgrounds are objects misreconstructed as photons. To accurately estimate the contribution of these objects to a photon sample, the origin of reconstructed photons has to be investigated. This presentation focuses on electrons which are misidentified as photons. The propability of an electron being reconstructed as a photon is described by the so called “fake rate”.

The fake rate is studied in data and simulation at a center-of-mass energy of 13 TeV with the CMS experiment. As a clean electron source, the Z-boson decay to electrons is used. The dependency of the fake rate on several observables is studied and compared to earlier results.