Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 5: Methods in particle physics 1 (e/gamma, SciFi)
T 5.2: Talk
Monday, March 4, 2024, 16:15–16:30, Geb. 20.30: 2.066
Measurement of photon identification efficiencies with the inclusive photon method using 2022 CMS data — Johannes Erdmann, •Nitish Kumar, and Jan Lukas Späh — III. Physikalisches Institut A, RWTH Aachen University
The measurement of the photon identification efficiency is an essential component of all analyses using photons. Currently, the CMS collaboration uses the tag-and-probe technique to measure the photon identification efficiencies up to photon pT of 500 GeV. This method is limited by small event yields in the high-pT region and the extrapolation beyond 500 GeV is associated with additional uncertainties, which is relevant for analyses involving high-pT photons.
The inclusive photon method, also known as the matrix method, allows a precise measurement of the photon identification efficiencies at high photon pT. This method uses an inclusive photon sample selected with single photon triggers. It utilizes isolation criteria to obtain the fraction of prompt photons in the whole sample and the subsample meeting the identification criteria. This enables the extraction of the photon identification efficiency in a data-driven way. In this talk, we present the preliminary measurement results of photon identification efficiencies with the inclusive photon method using data collected by the CMS experiment in 2022.
Keywords: Photons; Photon identification efficiency; Inclusive photon method; Photon performance studies