Flavor changing top decays to charm and Higgs with $\tau \tau$ at the LHC

Abstract

We investigate the prospects of discovering the top quark decay into a charm quark and a Higgs boson ($t\to c{h}^0$) in top quark pair production at the CERN Large Hadron Collider (LHC). A general two Higgs doublet model is adopted to study flavor changing neutral Higgs (FCNH) interactions. We perform a parton level analysis as well as Monte Carlo simulations using \textsc{Pythia}~8 and \textsc{Delphes} to study the flavor changing top quark decay $t\to c{h}^0$, followed by the Higgs decaying into ${\tau }^{+}{\tau }^{-}$, with the other top quark decaying to a bottom quark ($b$) and two light jets ($t\to bW\to bjj$). To reduce the physics background to the Higgs signal, only the leptonic decays of tau leptons are used, $τ^+τ^- \to e^\pmμ^\mp +\slashed{E}_T$, where $\slashed{E}_T$ represents the missing transverse energy from the neutrinos. In order to reconstruct the Higgs boson and top quark masses as well as to effectively remove the physics background, the collinear approximation for the highly boosted tau decays is employed. Our analysis suggests that a high energy LHC at $\sqrt{s}=27$ TeV will be able to discover this FCNH signal with an integrated luminosity $\mathcal{L}=3$ ab${}^{-1}$ for a branching fraction ${\cal B}(t \to ch^0) \agt 1.4 \times 10^{-4}$ that corresponds to a FCNH coupling $|λ_{tch}| \agt 0.023$. This FCNH coupling is significantly below the current ATLAS combined upper limit of $|{\lambda }_{tch}|=0.064$.

arXiv commentREVTEX, 18 pages, 7 figures, to be published in Phys. Rev. D

References in corpus (59)

• 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
• An Introduction to PYTHIA 8.2
• DELPHES 3, A modular framework for fast simulation of a generic collider experiment
• MadGraph 5 : Going Beyond
• Final Report of the Muon E821 Anomalous Magnetic Moment Measurement at BNL
• New parton distribution functions from a global analysis of quantum chromodynamics
• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• Top++: a program for the calculation of the top-pair cross-section at hadron colliders
• The anomalous magnetic moment of the muon in the Standard Model
• The CP-conserving two-Higgs-doublet model: the approach to the decoupling limit
• Leading hadronic contribution to the muon magnetic moment from lattice QCD
• Test of lepton universality with $B^0\to K^{\ast 0}{\ell }^{+}{\ell }^{-}$ decays
• Measurement of an Excess of B -> D(*) Tau Nu Decays and Implications for Charged Higgs Bosons
• Measurement of the branching ratio of $\bar{B}\to D^{(\ast )}{\tau }^{-}{\bar{\nu }}_{\tau }$ relative to $\bar{B}\to D^{(\ast )}{\ell }^{-}{\bar{\nu }}_{\ell }$ decays with hadronic tagging at Belle
• Measurement of the ratio of branching fractions $\mathcal{B}({\overline{B}}^0\to D^{\ast +}{\tau }^{-}{\overline{\nu }}_{\tau })/\mathcal{B}({\overline{B}}^0\to D^{\ast +}{\mu }^{-}{\overline{\nu }}_{\mu })$
• Combined measurements of Higgs boson production and decay using up to $80$ fb${}^{-1}$ of proton-proton collision data at $\sqrt{s}=$ 13 TeV collected with the ATLAS experiment
• Combined measurements of Higgs boson couplings in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• ATLAS $b$-jet identification performance and efficiency measurement with $t\bar{t}$ events in $pp$ collisions at $\sqrt{s}=13$ TeV
• Basis-independent methods for the two-Higgs-doublet model
• Explaining B->Dτν, B->D*τνand B->τνin a 2HDM of type III
• Search for lepton-flavour-violating decays of the Higgs boson
• Impersonating the Standard Model Higgs Boson: Alignment without Decoupling
• Flavor constraints on two-Higgs-doublet models with general diagonal Yukawa couplings
• Search for heavy Higgs bosons decaying into two tau leptons with the ATLAS detector using $pp$ collisions at $\sqrt{s}=13$ TeV
• Searching for H --> tau tau in weak boson fusion at the LHC
• A new evaluation of the t->cH decay width in the standard model
• A measurement of the Higgs boson mass in the diphoton decay channel
• Measurement of angular parameters from the decay ${\mathrm{B}}^0\to {\mathrm{K}}^{\ast 0}{\mu }^{+}{\mu }^{-}$ in proton-proton collisions at $\sqrt{s}=$ 8 TeV
• A global approach to top-quark flavor-changing interactions
• A method for identifying H -> tau tau -> e mu pTmiss at the CERN LHC
• Vectorlike leptons at the Large Hadron Collider
• Search for lepton-flavour-violating decays of the Higgs and $Z$ bosons with the ATLAS detector
• Cross-section measurements of the Higgs boson decaying into a pair of tau-leptons in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Probing top flavour-changing neutral scalar couplings at the CERN LHC
• Measurements of $\mathrm{t}\bar{\mathrm{t}}$H production and the CP structure of the Yukawa interaction between the Higgs boson and the top quark in the diphoton decay channel
• When the Higgs meets the Top: Search for t --> ch^0 at the LHC
• Electroweak Baryogenesis driven by Extra Top Yukawa Couplings
• Flavor Changing Heavy Higgs Interactions at the LHC
• Searches for heavy Higgs bosons in two-Higgs-doublet models and for t to ch decay using multilepton and diphoton final states in pp collisions at 8 TeV
• A Two Higgs Doublet Model for the Top Quark
• Search for lepton flavour violating decays of the Higgs boson to $\mu \tau$ and e$\tau$ in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• TauDecay: a library to simulate polarized tau decays via FeynRules and MadGraph5
• Measurement of the top-quark mass in $t\bar{t}+1$-jet events collected with the ATLAS detector in $pp$ collisions at $\sqrt{s}=8$ TeV
• Measurement of the production cross section for single top quarks in association with W bosons in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Search for top-quark decays $t\to Hq$ with 36 fb${}^{-1}$ of $pp$ collision data at $\sqrt{s}=13$ TeV with the ATLAS detector
• Top Decays with Flavor Changing Neutral Higgs Interactions at the LHC
• 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
• Search for top quark decays via Higgs-boson-mediated flavor-changing neutral currents in pp collisions at sqrt(s) = 8 TeV
• Constraining the flavor changing Higgs couplings to the top-quark at the LHC
• Measurement of differential cross-sections of a single top quark produced in association with a $W$ boson at $\sqrt{s}=13$ TeV with ATLAS
• Search for lepton flavour violating decays of a neutral heavy Higgs boson to $\mu \tau$ and e$\tau$ in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Rare top quark decays at a 100 TeV proton-proton collider: $t\to bWZ$ and $t\to hc$
• Search for t->ch at e+e- Linear Colliders
• Search for the $t\to ch$ decay at hadron colliders
• Search for Flavor Changing Neutral Currents in $t\to Hc,H\to \tau \tau$ Decay at the LHC
• Charming Top Decays with Flavor Changing Neutral Higgs Boson and WW at Hadron Colliders
• Novel flavour-changing neutral currents in the top quark sector
• Flavor changing Flavon decay $\varphi \to tc$ ($\varphi =H_F,A_F$) at the High Luminosity Large Hadron Collider

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