Search for top quark decays $t\to qH$ with $H\to \gamma \gamma$ using the ATLAS detector

Abstract

A search is performed for flavour-changing neutral currents in the decay of a top quark to an up-type ($c,u$) quark and a Higgs boson, where the Higgs boson decays to two photons. The proton-proton collision data set used corresponds to 4.7 fb${}^{-1}$ at $\sqrt{s}$ = 7 \tev\ and 20.3 fb${}^{-1}$ at $\sqrt{s}$ = 8 \tev\ collected by the ATLAS experiment at the LHC. Top quark pair events are searched for in which one top quark decays to $qH$ and the other decays to $bW$. Both the hadronic and the leptonic decay modes of the $W$ boson are used. No significant signal is observed and an upper limit is set on the $t\to qH$ branching ratio of 0.79% at the 95% confidence level. The corresponding limit on the $tqH$ coupling combination $\sqrt{{\lambda }_{tcH}^2+{\lambda }_{tuH}^2}$ is 0.17.

arXiv comment22 pages plus author list (45 pages total), 6 figures, 4 tables, submitted to JHEP. All figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-09

References in corpus (60)

• 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
• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• The anti-k_t jet clustering algorithm
• A Brief Introduction to PYTHIA 8.1
• Asymptotic formulae for likelihood-based tests of new physics
• Event generation with SHERPA 1.1
• HERWIG 6.5: an event generator for Hadron Emission Reactions With Interfering Gluons (including supersymmetric processes)
• ALPGEN, a generator for hard multiparton processes in hadronic collisions
• Matching NLO QCD computations and parton shower simulations
• The ATLAS Simulation Infrastructure
• The total top quark pair production cross-section at hadron colliders through O(alpha_S^4)
• PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays
• Tuning Monte Carlo Generators: The Perugia Tunes
• Pileup subtraction using jet areas
• Multiparton Interactions in Photoproduction at HERA
• Improved luminosity determination in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector at the LHC
• Kernel Estimation in High-Energy Physics
• The PDF4LHC Working Group Interim Recommendations
• Measurements of Higgs boson production and couplings in diboson final states with the ATLAS detector at the LHC
• Jet energy measurement with the ATLAS detector in proton-proton collisions at sqrt(s) = 7 TeV
• Electron performance measurements with the ATLAS detector using the 2010 LHC proton-proton collision data
• NLO Higgs boson production via vector-boson fusion matched with shower in POWHEG
• NLO Higgs boson production via gluon fusion matched with shower in POWHEG
• Phenomenology of Two Higgs Doublet Models with Flavor Changing Neutral Currents
• Handbook of LHC Higgs Cross Sections: 2. Differential Distributions
• MINLO: Multi-scale improved NLO
• Measurement of the inclusive isolated prompt photon cross section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• A minimal set of top-Higgs anomalous couplings
• Effects of mixing with quark singlets
• FCNC top quark decay in the MSSM: a door to SUSY physics in high luminosity colliders?
• SUSY-induced FCNC top-quark processes at the Large Hadron Collider
• New Supersymmetric Contributions to $t->cV$
• Flavour Changing Neutral Currents, Weak-Scale Scalars and Rare Top Decays
• Flavour changing top decays in supersymmetric extensions of the standard model
• Constraints on top couplings in models with exotic quarks
• Loop Induced Flavor Changing Neutral Decays of the Top Quark in a General Two-Higgs-Doublet Model
• Measurement of the inclusive isolated prompt photon cross-section in pp collisions at sqrt(s)= 7 TeV using 35 pb-1 of ATLAS data
• Lifting degeneracies in Higgs couplings using single top production in association with a Higgs boson
• Rare top decays t -> c gamma, t -> c g and CKM unitarity
• When the Higgs meets the Top: Search for t --> ch^0 at the LHC
• Search for Single Top Production at LEP
• Measurement of the inclusive isolated prompt photon cross section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector using 4.6 fb-1
• Single top and Higgs associated production as a probe of the Htt coupling sign at the LHC
• Search for the Flavor Changing Neutral Current Decay t $\to Zq$ in $p\bar{p}$ Collisions at $\sqrt{s}=1.96$
• Search for flavor-changing neutral currents in top-quark decays t to Zq in pp collisions at sqrt(s) = 8 TeV
• $t\to cV$ via SUSY FCNC couplings in the unconstrained MSSM
• Search for Single Top Quark Production at LEP2
• Top-quark decay into Higgs boson and a light quark at next-to-leading order in QCD
• Search for single-top production in ep collisions at HERA
• Search for Single Top Quark Production in ep Collisions at HERA
• Search for Single Top Production in e+e- Collisions at sqrt(s) up to 209GeV
• A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at sqrt(s) = 7 TeV
• Scalar FCNC and rare top decays in a two Higgs doublet model "for the top"
• Search for single top production via FCNC at LEP at sqrt(s) = 189-208 GeV
• Search for Single Top Quark Production at HERA
• Search for the Standard Model Higgs boson in the two photon decay channel with the ATLAS detector at the LHC
• Top flavour violating decays in general supersymmetric models

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• Direct and Indirect Searches for Top-Higgs FCNC Couplings
• Probing Anomalous FCNC Top-Higgs Yukawa Couplings at the Large Hadron Electron Collider
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• Controlled Flavour Changing Neutral Couplings in Two Higgs Doublet Models
• Top-quark physics at the Large Hadron Collider
• Searches for top-Higgs FCNC couplings via the Whj signal with $h\to \gamma \gamma$ at the LHC
• Higgs couplings and new signals from Flavon-Higgs mixing effects within multi-scalar models
• Lightness of Higgs Boson and Spontaneous CP Violation in Lee Model
• Probing the top quark flavor-changing couplings at CEPC
• Searches for the Anomalous FCNC Top-Higgs Couplings with Polarized Electron Beam at the LHeC
• Search for top quark flavour changing neutral currents in same-sign top quark production
• What can We Learn from Triple Top-Quark Production?
• Search for Flavor Changing Neutral Currents in $t\to Hc,H\to \tau \tau$ Decay at the LHC
• Decadal Mission for the New Physics Higgs/Flavor Era
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• Flavor from the Electroweak Scale
• Rare Higgs three body decay induced by top-Higgs FCNC coupling in the littlest Higgs Model with T-parity