Search for flavor-changing neutral currents in top quark decays $t\to Hc$ and 
$t \to Hu$ in multilepton final states in proton--proton collisions at 
$\sqrt{s}= 13$ TeV with the ATLAS detector

ATLAS Collaboration,

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Search for flavor-changing neutral currents in top quark decays $t\to Hc$ and $t \to Hu$ in multilepton final states in proton--proton collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector

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ATLAS Collaboration,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

ATLAS Collaboration (2018). Search for flavor-changing neutral currents in top quark decays $t\to Hc$ and $t \to Hu$ in multilepton final states in proton--proton collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector. Physical Review D, (98), 032002. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2018-93.

Cite as: https://hdl.handle.net/21.11116/0000-0003-F819-A

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 dataset corresponding to an integrated luminosity of 36.1 fb$^{-1}$ of $pp$ collisions at a center-of-mass energy of $\sqrt{s}=$ 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 $\mathcal{B}(t \to Hc) <$ 0.16% and $\mathcal{B}(t \to H u) <$ 0.19% at 95% confidence level are obtained (with expected limits of 0.15% in both cases).