Search for flavor-changing neutral currents in top quark decays t -> Hc and t -> Hu in multilepton final states in proton-proton collisions at root s=13 TeV with the ATLAS detectorShow others and affiliations
Number of Authors: 28952018 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 98, no 3, article id 032002Article in journal (Refereed) Published
Abstract [en]
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 conesponding to an integrated luminosity of 36.1 fb(-1) of pp collisions at a center-of-mass energy of root 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 -> Hc) < 0.16% and B(t -> Hu) < 0.19% at 95% confidence level are obtained (with expected limits of 0.15% in both cases).
Place, publisher, year, edition, pages
2018. Vol. 98, no 3, article id 032002
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-365146DOI: 10.1103/PhysRevD.98.032002ISI: 000440824200001OAI: oai:DiVA.org:uu-365146DiVA, id: diva2:1261912
Funder
Swedish Research CouncilEU, European Research CouncilEU, FP7, Seventh Framework ProgrammeEU, Horizon 2020Wallenberg Foundations
Note
For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.98.032002
2018-11-082018-11-082019-06-26Bibliographically approved