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Bibliographic Details
Main Author: Pardos, Carmen Diez
Format: Preprint
Published: 2024
Subjects:
Online Access:https://arxiv.org/abs/2411.15261
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Table of Contents:
  • Cross-section measurements of the associated production of a top quark pair and a photon ($t\bar{t}γ$) are performed with an integrated luminosity of 140 fb$^{-1}$ of proton-proton collisions at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the LHC. The measurement focuses on $t\bar{t}γ$ topologies where the photon is radiated from an initial-state parton or one of the top quarks. The differential cross-sections are measured for variables characterising the photon, lepton and jet kinematic properties. The distribution of the photon transverse momentum is used to constrain effective field theory operators related to the electroweak dipole moments of the top quark.