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

Rimoldi, Marco; Mullier, Geoffrey; Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Meloni, Federico; Beck, Hans Peter; Ereditato, Antonio (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 - particles, fields, gravitation, and cosmology, 98(3) American Physical Society 10.1103/PhysRevD.98.032002

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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 36.1fb⁻¹ of pp collisions at a center-of-mass energy of √s = 13 TeV recorded with the ATLAS detectorat 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% andB(t→Hu) <0.19% at 95% confidence level are obtained (with expected limits of 0.15% in both cases).

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Haug, Sigve; Weber, Michael and Beck, Hans Peter

Subjects:

500 Science > 530 Physics

ISSN:

1550-7998

Publisher:

American Physical Society

Language:

English

Submitter:

BORIS Import LHEP

Date Deposited:

25 Jun 2019 10:27

Last Modified:

29 Oct 2019 06:53

Publisher DOI:

10.1103/PhysRevD.98.032002

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwaehnt

BORIS DOI:

10.7892/boris.129051

URI:

https://boris.unibe.ch/id/eprint/129051

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