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T: Fachverband Teilchenphysik

T 79: Top quark production III

T 79.4: Vortrag

Donnerstag, 18. März 2021, 16:45–17:00, Td

Differential measurement of ttbar in association with a photon — •Beatriz Lopes, Alessia Saggio, and Abideh Jafari — DESY, Hambueg, Germany

Precision measurements of top quark production provide a test ground for the Standard Model (SM) predictions and for phenomena beyond the SM.

In this context, the production of tt in association with a photon is an important process. It is sensitive to the electroweak top-photon coupling, which can be constrained by cross-section measurements. The results can also be interpreted in the context of Effective Field Theory, where new physics scenarios that predict modifications to the t−γ interaction can be constrained.

In this talk, I will present several differential cross-section measurements of this process in the dilepton channel, using lepton, photon and top variables. This measurement is based on data collected by the CMS experiment at the LHC during the full Run 2 (2016-2018).