Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 62: Standard model 2 (electroweak/bosons)

T 62.6: Talk

Wednesday, March 6, 2024, 17:15–17:30, Geb. 30.23: 2/0

Fake photon background estimate with the template fit method at ATLAS — •Tobias Heintz — Kirchhoff Institute for Physics, Heidelberg University

Photons are an important signature in the final state of proton-proton collisions at the Large Hadron Collider. A background contribution to these final states are so-called fake photons, which are not promptly produced in the pp collision, but arise within the fragmentation of jets, mainly via π⁰ → γ γ. This study deals with a template fit method to estimate the background contribution of fake photons. As established in various multi-boson analyses at ATLAS, templates for the isolation energy distribution are extracted using Monte Carlo simulations. The templates are currently extracted for each final state separately, so this study aims to extract generic templates that can be used for photons in different final states. Therefore, the dependence of the isolation templates on the transverse momentum of the photon, p_T, is investigated. Considering the correlations between the isolation energy and p_T and taking into account the p_T distribution of the investigated phase space, the same templates can be used for photons in the Zγ and Zγγ process.

Keywords: ATLAS; template fit; fake photons