Search for $H\to \gamma \gamma$ produced in association with top quarks and constraints on the Yukawa coupling between the top quark and the Higgs boson using data taken at 7 TeV and 8 TeV with the ATLAS detector

Abstract

A search is performed for Higgs bosons produced in association with top quarks using the diphoton decay mode of the Higgs boson. Selection requirements are optimized separately for leptonic and fully hadronic final states from the top quark decays. The dataset used corresponds to an integrated luminosity of 4.5 fb${}^{-1}$ of proton-proton collisions at a center-of-mass energy of 7 TeV and 20.3 fb${}^{-1}$ at 8 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. No significant excess over the background prediction is observed and upper limits are set on the $t\bar{t}H$ production cross section. The observed exclusion upper limit at 95% confidence level is 6.7 times the predicted Standard Model cross section value. In addition, limits are set on the strength of the Yukawa coupling between the top quark and the Higgs boson, taking into account the dependence of the $t\bar{t}H$ and $tH$ cross sections as well as the $H\to \gamma \gamma$ branching fraction on the Yukawa coupling. Lower and upper limits at 95% confidence level are set at -1.3 and +8.0 times the Yukawa coupling strength in the Standard Model.

arXiv comment12 pages plus author list + cover pages (24 pages total), 7 figures, 4 tables, submitted to Physics Letters B, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-25/

References in corpus (67)

• 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
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• A Brief Introduction to PYTHIA 8.1
• Parton distributions for the LHC
• Asymptotic formulae for likelihood-based tests of new physics
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• New parton distributions for collider physics
• Herwig++ Physics and Manual
• The ATLAS Simulation Infrastructure
• HDECAY: a Program for Higgs Boson Decays in the Standard Model and its Supersymmetric Extension
• Implications of CTEQ global analysis for collider observables
• Next-to-Next-to-Leading Order Higgs Production at Hadron Colliders
• Higgs boson production at hadron colliders in NNLO QCD
• HIGGS BOSON PRODUCTION AT THE LHC
• Pileup subtraction using jet areas
• MadEvent: Automatic Event Generation with MadGraph
• NNLO corrections to the total cross section for Higgs boson production in hadron-hadron collisions
• Soft-gluon resummation for Higgs boson production at hadron colliders
• Improved luminosity determination in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector at the LHC
• The PDF4LHC Working Group Interim Recommendations
• NLO Electroweak Corrections to Higgs Boson Production at Hadron Colliders
• Measurements of Higgs boson production and couplings in diboson final states with the ATLAS detector at the LHC
• NNLO QCD corrections to the Higgs-strahlung processes at hadron colliders
• VBFNLO: A parton level Monte Carlo for processes with electroweak bosons
• Higgs Radiation off Top Quarks at the Tevatron and the LHC
• Two-loop light fermion contribution to Higgs production and decays
• Electroweak and QCD corrections to Higgs production via vector-boson fusion at the LHC
• NLO QCD corrections to t anti-t H production in hadron collisions
• NLO Higgs boson production via vector-boson fusion matched with shower in POWHEG
• Jet energy measurement and its systematic uncertainty in proton-proton collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• NLO Higgs boson production via gluon fusion matched with shower in POWHEG
• Strong and electroweak corrections to the production of Higgs+2jets via weak interactions at the LHC
• Performance of the ATLAS Trigger System in 2010
• Impact of Heavy Quark Masses on Parton Distributions and LHC Phenomenology
• Electroweak Radiative Corrections to Associated WH and ZH Production at Hadron Colliders
• Higgs production via vector-boson fusion at NNLO in QCD
• Electron and photon energy calibration with the ATLAS detector using LHC Run 1 data
• Precise predictions for the Higgs-boson decay H -> W W/Z Z -> 4 leptons
• Handbook of LHC Higgs Cross Sections: 2. Differential Distributions
• Associated Higgs production with top quarks at the Large Hadron Collider: NLO QCD corrections
• Measurement of the Higgs boson mass from the $H\to \gamma \gamma$ and $H\to Z{Z}^{\ast }\to 4\ell$ channels with the ATLAS detector using 25 fb${}^{-1}$ of $pp$ collision data
• Electron reconstruction and identification efficiency measurements with the ATLAS detector using the 2011 LHC proton-proton collision data
• Single-top t-channel hadroproduction in the four-flavour scheme with POWHEG and aMC@NLO
• Standard Model Higgs-Boson Branching Ratios with Uncertainties
• Helac-nlo
• NNLO Computational Techniques: the Cases H -> gamma gamma and H -> g g
• Measurement of the inclusive isolated prompt photon cross section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Scalar and pseudoscalar Higgs production in association with a top-antitop pair
• Associated Top Quark-Higgs Boson Production at the LHC
• Search for the associated production of the Higgs boson with a top-quark pair
• On the characterisation of the underlying event
• Lifting degeneracies in Higgs couplings using single top production in association with a Higgs boson
• QCD corrections to Associated t-tbar-H production at the Tevatron
• Standard Model Higgs boson production in association with a top anti-top pair at NLO with parton showering
• Associated production of Higgs and single top at hadron colliders
• Measurement of the cross-section for W boson production in association with b-jets in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Single top and Higgs associated production as a probe of the Htt coupling sign at the LHC
• Muon reconstruction efficiency and momentum resolution of the ATLAS experiment in proton-proton collisions at $\sqrt{s}$=7 TeV in 2010
• Search for top quark decays $t\to qH$ with $H\to \gamma \gamma$ using the ATLAS detector
• Single top and Higgs associated production at the LHC
• Effect of Anomalous Couplings on the Associated Production of a Single Top Quark and a Higgs Boson at the LHC
• A study of heavy flavor quarks produced in association with top quark pairs at sqrt(s) = 7 TeV using the ATLAS detector
• Higgs Bosons from Top Quark Decays

Cited by in corpus (57)

• Measurements of the Higgs boson production and decay rates and constraints on its couplings from a combined ATLAS and CMS analysis of the LHC $pp$ collision data at $\sqrt{s}=$ 7 and 8 TeV
• 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
• Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector
• Measurements of the Higgs boson production and decay rates and coupling strengths using $pp$ collision data at $\sqrt{s}=7$ and $8$ TeV in the ATLAS experiment
• Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector
• Physics at the e+ e- Linear Collider
• Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector
• Higgs production in association with a top-antitop pair in the Standard Model Effective Field Theory at NLO in QCD
• Search for long-lived, weakly interacting particles that decay to displaced hadronic jets in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Search for the Standard Model Higgs boson produced in association with top quarks and decaying into a $b\bar{b}$ pair in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• 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
• Measurements of the Total and Differential Higgs Boson Production Cross Sections Combining the $H\to \gamma \gamma$ and $H\to Z{Z}^{\ast }\to 4\ell$ Decay Channels at $\sqrt{s}=8$ TeV with the ATLAS Detector
• Trilinear Higgs coupling determination via single-Higgs differential measurements at the LHC
• Lab-frame observables for probing the top-Higgs interaction
• Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector
• Strong tW Scattering at the LHC
• Measurement of the Higgs boson production rate in association with top quarks in final states with electrons, muons, and hadronically decaying tau leptons at $\sqrt{s}=$ 13 TeV
• Associated top quark pair production with a heavy boson: differential cross sections at NLO+NNLL accuracy
• NLO QCD corrections to off-shell top-antitop production with leptonic decays in association with a Higgs boson at the LHC
• Evidence for associated production of a Higgs boson with a top quark pair in final states with electrons, muons, and hadronically decaying $\tau$ leptons at $\sqrt{s}=$ 13 TeV
• Pinning down electroweak dipole operators of the top quark
• Higgs production in association with off-shell top-antitop pairs at NLO EW and QCD at the LHC
• Soft gluon resummation for associated $t\bar{t}H$ production at the LHC
• Gluon-fusion Higgs production in the Standard Model Effective Field Theory
• Probing the CP nature of the Higgs coupling in $t\bar{t}h$ events at the LHC
• Electroweak and QCD corrections to top-pair hadroproduction in association with heavy bosons
• Search for the Standard Model Higgs boson decaying into $b\bar{b}$ produced in association with top quarks decaying hadronically in $pp$ collisions at $\sqrt{s}$=8 TeV with the ATLAS detector
• Measuring the Top Yukawa Coupling at 100 TeV
• Associated $t\bar{t}H$ production at the LHC: theoretical predictions at NLO+NNLL accuracy
• Single top-quark production at the Tevatron and the LHC
• The Lepton Flavour Violating Higgs Decays at the HL-LHC and the ILC
• Anatomy of the Higgs fits: a first guide to statistical treatments of the theoretical uncertainties
• Top-Quark Physics: Status and Prospects
• Revisiting $B_s\to {\mu }^{+}{\mu }^{-}$ in the two-Higgs doublet models with $Z_2$ symmetry
• Search for the associated production of a Higgs boson with a single top quark in proton-proton collisions at sqrt(s) = 8 TeV
• Constraining the Higgs Boson Coupling to Light Quarks in the $H\to ZZ$ Final States
• The correlation matrix of Higgs rates at the LHC
• Angular distributions in $t\bar{t}H(H\to b\bar{b})$ reconstructed events at the LHC
• Golden Probe of the Top Yukawa
• Top-quark physics at the Large Hadron Collider
• Central-edge asymmetry as a probe of Higgs-top coupling in $t\bar{t}h$ production at LHC
• Novel Collider and Dark Matter Phenomenology of a Top-philic Z'
• Enhancing the Higgs associated production with a top quark pair
• The compatibility of LHC Run 1 data with a heavy scalar of mass around 270\,GeV
• Higgs boson couplings: measurements and theoretical interpretation
• Tagging a mono-top signature in Natural SUSY
• Enhanced Higgs associated production with a top quark pair in the NMSSM with light singlets
• Measuring the signal strength in ttH with H->bb
• Light stop in the MSSM after LHC Run 1
• Discriminating the HTM and MLRSM models in collider studies via doubly charged Higgs boson pair production and the subsequent leptonic decays
• Mono-top Signature from Supersymmetric $t\bar{t}H$ Channel
• Testing Naturalness
• Entangling Higgs production associated with a single top and a top-quark pair in the presence of anomalous top-Yukawa coupling
• Irreducible background and interference effects for Higgs-boson production in association with a top-quark pair
• Fermionic decays of SM Higgs
• Phenomenology of additional scalar bosons at the LHC
• Experimental searches for tHq