Constraints on flavor-changing neutral-current $Htq$ couplings from the signal of $tH$ associated production with QCD next-to-leading order accuracy at the LHC

Abstract

We study a generic Higgs boson and a top quark associated production via model-independent flavor-changing neutral-current couplings at the LHC, including complete QCD next-to-leading order (NLO) corrections to the production and decay of the top quark and the Higgs boson. We find that QCD NLO corrections can increase the total production cross sections by about 48.9% and 57.9% for the $Htu$ and $Htc$ coupling induced processes at the LHC, respectively. After kinematic cuts are imposed on the decay products of the top quark and the Higgs boson, the QCD NLO corrections are reduced to 11% for the $Htu$ coupling induced process and almost vanish for the $Htc$ coupling induced process. Moreover, QCD NLO corrections reduce the dependence of the total cross sections on the renormalization and factorization scales. We also discuss signals of the $tH$ associated production with the decay mode $t \rightarrow bl^{+}E \slash_{T}, H \rightarrow b\bar{b}$ and $t\bar{t}$ production with the decay mode $\bar{t} \rightarrow H\bar{q}, t\rightarrow bl^{+}E \slash_{T}$. Our results show that, in some parameter regions, the LHC may observe the above signals at the $5\sigma$ level. Otherwise, the upper limits on the FCNC $Htq$ couplings can be set.

28 pages, 14 figures, 5 tables; version published in PRD

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• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Next-to-leading order QCD corrections to the top quark decay via model-independent FCNC couplings
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Cited by in corpus (10)

• A global approach to top-quark flavor-changing interactions
• Higgs production in association with a top-antitop pair in the Standard Model Effective Field Theory at NLO in QCD
• Automatic computations at next-to-leading order in QCD for top-quark flavor-changing neutral processes
• Disentangling Flavor Violation in the Top-Higgs Sector at the LHC
• SUSY induced top quark FCNC decay $t\to ch$ after Run I of LHC
• Rare Top-quark Decays to Higgs boson in MSSM
• Impact of top-Higgs couplings on di-Higgs production at future colliders
• Searches for anomalous $tqZ$ couplings from the trilepton signal of $tZ$ associated production at the 14 TeV LHC
• Searches for the FCNC couplings from top-Higgs associated production signal with $h\to \gamma \gamma$ at the LHC
• Effective approach to top-quark decay and FCNC processes at NLO accuracy