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T: Fachverband Teilchenphysik

T 74: Top physics 3 (single top)

T 74.6: Vortrag

Mittwoch, 6. März 2024, 17:15–17:30, Geb. 30.95: Audimax

Estimation of the background contributions of non-prompt or misidentified photons from hadronic activity to the differential cross-section measurements of single-top quark production in association with a photon with the ATLAS experiment at √s=13 TeV — •Nils J. Abicht, Lucas Cremer, Tomas Dado, and Andrea H. Knue — TU Dortmund, Experimentelle Physik

The differential cross-section measurements of single-top quark production in association with a photon represent a test of the standard model, particularly of the coupling between the top quark and the photon.

A significant background for the process arises from non-prompt or misidentified photons from hadronic activity. Since this background contribution is not necessarily well-modeled in Monte Carlo simulations, a data-driven approach is employed. Four orthogonal selections are constructed in order to exploit the weak correlation between certain photon identification variables and photon track isolation. One of these selections matches the requirements of the photons used in the differential cross-section measurements and the other three selections are enriched with non-prompt or misidentified photons. The data contributions in the latter selections are used to extrapolate to the misidentification efficiency in the former selection. A description of the data-driven method, systematic uncertainties as well as an estimation obtained using the complete ATLAS LHC Run-2 dataset, corresponding to an integrated luminosity of 140 fb⁻¹, are presented.

Keywords: Single Top; Photon