Measurements of inclusive and differential cross-sections of tt̅γ production in pp collisions at √(s)=13 TeV with the ATLAS detector
arxiv(2024)
摘要
Inclusive and differential cross-sections are measured at particle level for
the associated production of a top quark pair and a photon (tt̅γ).
The analysis is performed using 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. The measurements are performed in the single-lepton and
dilepton top quark pair decay channels focusing on tt̅γ topologies
where the photon is radiated from an initial-state parton or one of the top
quarks. The absolute and normalised differential cross-sections are measured
for several variables characterising the photon, lepton and jet kinematics as
well as the angular separation between those objects. The observables are found
to be in good agreement with the Monte Carlo predictions. The photon transverse
momentum differential distribution is used to set limits on effective field
theory parameters related to the electroweak dipole moments of the top quark.
The combined limits using the photon and the Z boson transverse momentum
measured in tt̅ production in associations with a Z boson are also
set.
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