Direct and indirect searches for top-Higgs FCNC couplings

2015/08/31 by H. Hesari, Hoda Hesari, Hamzeh Khanpour +2 · 26 citations
Physics and Astronomy · #Branching fraction #Charm quark #Coupling (piping) #Electroweak interaction #Higgs boson #High-Energy Particle Collisions Research #Neutrino Physics Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quark #Standard Model (mathematical formulation) #Top quark #hep-ph

paper · pdf · doi:10.1103/physrevd.92.113012

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 92(11) (American Physical Society) · 13 Pages, 3 Figures, 3 Tables

openalex publication_date 2015/12/29 · arxiv created 2016/01/13 · arxiv updated 2016/01/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Large top-quark flavor changing through neutral currents is expected by many extensions of the standard model. Direct and indirect searches for flavor-changing neutral currents (FCNC) in the top-quark decays to an up-type quark (up, charm) and a Higgs boson are presented. We probe the observability of the top-Higgs FCNC couplings through the process e^\ensuremath-e⁺\ensuremath→t(\ensuremath→\ensuremathℓ\ensuremathν_\ensuremathℓb)t(\ensuremath→qH), where \ensuremathℓ=e, \ensuremathμ and q reflects up and charm quarks. It is shown that the branching ratio Br(t\ensuremath→qH) can be probed down to 1.12\ifmmode×\else\texttimes\fi10^\ensuremath-3 at 95% C.L. at the center-of-mass energy of 500 GeV with an integrated luminosity of 3000 fb^\ensuremath-1. We also update the constraint on the top-Higgs FCNC coupling using the electroweak precision observables related to Z\ensuremath→cc decay.

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