Searches for the FCNC couplings from top-Higgs associated production signal with $h\to \gamma \gamma$ at the LHC

Abstract

In this paper, we study the observability of the top-Higgs flavor changing neutral current (FCNC) $tqh$ coupling through the process $pp\to qg\to t(\to {\ell }^{+}b\nu )h(\to \gamma \gamma )$ at the Large Hadron Collider~(LHC), where $\ell =e,\mu$. Our numerical results show that, in some parameter regions, the LHC may observe the above signals at the $5\sigma$ level. Otherwise, the branching ratios $Br(t\to uh)$ and $Br(t\to ch)$ can be respectively probed to $0.036\%$ and $0.13\%$ at $3\sigma$ level at 14 TeV LHC with the high integrated luminosity of 3000 fb${}^{-1}$. On the other hand, studying the charge ratio for the lepton in top quark decay can be not only used to discriminate between signal and backgrounds, but also used to discriminate between $tuh$ and $tch$ couplings, for which anomalous single top production comes from the up initiated channel and charm initiated channel.

References in corpus (28)

• 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
• Big-Bang Nucleosynthesis
• Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV
• MadAnalysis 5, a user-friendly framework for collider phenomenology
• Designing and recasting LHC analyses with MadAnalysis 5
• Effective-Field-Theory Approach to Top-Quark Production and Decay
• A minimal set of top-Higgs anomalous couplings
• Collider Signals of Top Quark Flavor Violation from a Warped Extra Dimension
• A global approach to top-quark flavor-changing interactions
• SUSY-induced FCNC top-quark processes at the Large Hadron Collider
• Higgs Mediated FCNC's in Warped Extra Dimensions
• Composite Higgs-Mediated FCNC
• Search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks using a matrix element method
• Automatic computations at next-to-leading order in QCD for top-quark flavor-changing neutral processes
• Single Top-Quark Production in Flavor-Changing Z' Models
• New Physics effects in the flavor-changing neutral couplings of the Top quark
• Next-to-leading order QCD corrections to the top quark decay via model-independent FCNC couplings
• The "Top Priority" at the LHC
• SUSY induced top quark FCNC decay $t\to ch$ after Run I of LHC
• Enhanced $thj$ signal at the LHC with $h\to \gamma \gamma$ decay and $\mathcal{C}\mathcal{P}$-violating top-Higgs coupling
• Rare Decay of the Top t->c l lbar and Single Top Production at International Linear Collider
• Combined effects of strong and electroweak FCNC effective operators in top quark physics at the LHC
• R-parity violating effects in top quark FCNC productions at LHC
• 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
• FCNC-induced heavy-quark events at the LHC from Supersymmetry
• Top quark three-body decays in the R-parity violating MSSM
• Probing the Top Quark Flavour-Changing Neutral Current at a Future Electron-Positron Collider

Cited by in corpus (6)

• Search for single production of the heavy vectorlike $T$ quark with $T\to th$ and $h\to \gamma \gamma$ at the high-luminosity LHC
• New flavor physics in di- and tri-lepton events from single-top at the LHC and beyond
• Searches for anomalous $tqZ$ couplings from the trilepton signal of $tZ$ associated production at the 14 TeV LHC
• Multi-lepton probes of new physics and lepton-universality in top-quark interactions
• Investigating Top-Higgs FCNC Couplings at the FCC-hh
• Single Higgs boson production in association with a top quark through FCNSI