Search for flavor-changing neutral currents in top quark decays t→Hc and t→Hu in multilepton final states in proton-proton collisions at √s=13 TeV with the ATLAS detector

, The ATLAS collaboration (2018) Search for flavor-changing neutral currents in top quark decays t→Hc and t→Hu in multilepton final states in proton-proton collisions at √s=13 TeV with the ATLAS detector. Physical Review D, 98 (3). ISSN 1550-7998

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Abstract

Flavor-changing neutral currents are not present in the Standard Model at tree level and are suppressed in loop processes by the unitarity of the Cabibbo-Kobayashi-Maskawa matrix; the corresponding rates for top quark decay processes are experimentally unobservable. Extensions of the Standard Model can generate new flavor-changing neutral current processes, leading to signals which, if observed, would be unambiguous evidence of new interactions. A data set corresponding to an integrated luminosity of 36.1 fb − 1 of p p collisions at a center-of-mass energy of √s=13 TeV recorded with the ATLAS detector at the Large Hadron Collider is used to search for top quarks decaying to up or charm quarks with the emission of a Higgs boson, with subsequent Higgs boson decay to final states with at least one electron or muon. No signal is observed and limits on the branching fractions B ( t → H c ) < 0.16 % and B ( t → H u ) < 0.19 % at 95% confidence level are obtained (with expected limits of 0.15% in both cases).

Item Type:
Journal Article
Journal or Publication Title:
Physical Review D
ID Code:
128144
Deposited By:
Deposited On:
12 Oct 2018 11:20
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Jul 2021 09:27