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Publication . 2020

Search for flavour-changing neutral currents in processes with one top quark and a photon using 81 fb.sup.-1./sup. of pp collisions at √s=13 TeV with the ATLAS experiment

Aad, G.; Abbott, B.; Abbott, D.C.; Chudoba, J. (Jiří); Hejbal, J. (Jiří); Hladík, O. (Ondřej); Jačka, P. (Petr); +14 Authors
Open Access   English  
Published: 01 Jan 2020
Country: Czech Republic
Abstract
A search for flavour-changing neutral current (FCNC) events via the coupling of a top quark, a photon, and an up or charm quark is presented using 81 fb −1 of proton–proton collision data taken at a centre-of-mass energy of 13 TeV with the ATLAS detector at the LHC. Events with a photon, an electron or muon, a b -tagged jet, and missing transverse momentum are selected. A neural network based on kinematic variables differentiates between events from signal and background processes. The data are consistent with the background-only hypothesis, and limits are set on the strength of the tqγ coupling in an effective field theory.
Subjects by Vocabulary

arXiv: High Energy Physics::Experiment High Energy Physics::Phenomenology Physics::Instrumentation and Detectors

Subjects

ATLAS, effective field theory, upper limit [coupling constant], statistical analysis, neural network, CERN LHC Coll, kinematics, background

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