Search for Higgs boson decays to a photon and a Z boson in pp collisions at sqrt(s)=7 and 8 TeV with the ATLAS detector

Abstract

A search is reported for a neutral Higgs boson in the decay channel H->Z gamma, Z->l+l- (l=e, mu), using 4.5 fb-1 of pp collisions at sqrt(s) = 7 TeV and 20.3 fb-1 of pp collisions at sqrt(s) = 8 TeV, recorded by the ATLAS detector at the CERN Large Hadron Collider. The observed distribution of the invariant mass of the three final-state particles, m(llgamma), is consistent with the Standard Model hypothesis in the investigated mass range of 120-150 GeV. For a Higgs boson with a mass of 125.5 GeV, the observed upper limit at the 95% confidence level is 11 times the Standard Model expectation. Upper limits are set on the cross section times branching ratio of a neutral Higgs boson with mass in the range 120-150 GeV between 0.13 and 0.5 pb for sqrt(s)=8 TeV at 95% confidence level.

9 pages plus author list (20 pages total), 3 figures, 2 tables, submitted to Physics Letters B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-05/

References in corpus (10)

• 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
• New parton distributions for collider physics
• Event generation with SHERPA 1.1
• NLO Electroweak Corrections to Higgs Boson Production at Hadron Colliders
• Study of the mass and spin-parity of the Higgs boson candidate via its decays to Z boson pairs
• Precise predictions for the Higgs-boson decay H -> W W/Z Z -> 4 leptons
• Search for the Standard Model Higgs boson in the diphoton decay channel with 4.9 fb-1 of pp collisions at sqrt(s) = 7 TeV with ATLAS
• Higgs boson decays to $\gamma \gamma$ and $Z\gamma$ in models with Higgs extensions
• Internal conversions in Higgs decays to two photons

Cited by in corpus (72)

• 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
• Physics of leptoquarks in precision experiments and at particle colliders
• Observation of the diphoton decay of the Higgs boson and measurement of its properties
• Collider Probes of Axion-Like Particles
• 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 the spin-parity and anomalous HVV couplings of the Higgs boson in proton collisions at 7 and 8 TeV
• Measurement of the muon reconstruction performance of the ATLAS detector using 2011 and 2012 LHC proton-proton collision data
• HiggsBounds-5: Testing Higgs Sectors in the LHC 13 TeV Era
• Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector
• Measurements of Higgs boson properties in the diphoton decay channel with 36 fb${}^{-1}$ of $pp$ collision data at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for a Higgs boson in the mass range from 145 to 1000 GeV decaying to a pair of W or Z bosons
• Dynamics of Perturbations in Double Field Theory & Non-Relativistic String Theory
• Scrutinizing the Alignment Limit in Two-Higgs-Doublet Models. Part 2: $m_H=125$ GeV
• Scrutinizing the Alignment Limit in Two-Higgs-Doublet Models. Part 1: $m_h=125$ GeV
• Physics at the e+ e- Linear Collider
• Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run-1 data
• Higgs coupling measurements at the LHC
• $h\to Z\gamma$ in the complex two Higgs doublet model
• New Physics Models Facing Lepton Flavor Violating Higgs Decays at the Percent Level
• LHC as an Axion Factory: Probing an Axion Explanation for $(g-2{)}_{\mu }$ with Exotic Higgs Decays
• A search for the $Z\gamma$ decay mode of the Higgs boson in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Searches for the $Z\gamma$ decay mode of the Higgs boson and for new high-mass resonances in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Next-to-Leading Order QCD Corrections to the Decay Width $H\to Z\gamma$
• Fermionic extensions of the Standard Model in light of the Higgs couplings
• Constraints on non-Standard Model Higgs boson interactions in an effective Lagrangian using differential cross sections measured in the $H\to \gamma \gamma$ decay channel at $\sqrt{s}=8$ TeV with the ATLAS detector
• Search for the decay of a Higgs boson in the $\ell \ell \gamma$ channel in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Evidence for the Higgs boson decay to a $Z$ boson and a photon at the LHC
• A reappraisal of the wrong-sign $hb\overline{b}$ coupling and the study of $h\to Z\gamma$
• Vacuum stability and naturalness in type-II seesaw
• Search for a Higgs boson decaying into gamma* gamma to ll gamma with low dilepton mass in pp collisions at sqrt(s) = 8 TeV
• A note on Higgs decays into $Z$ boson and $J/\Psi ({\rm Y})$
• Collider Constraints and Prospects of a Scalar Singlet Extension to Higgs Portal Dark Matter
• Search for Z$\gamma$ resonances using leptonic and hadronic final states in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Phenomenological analysis of Higgs boson production through gluon fusion in association with jets
• Double Higgs peak in the minimal SUSY B-L model
• Exclusive Weak Radiative Higgs Decays in the Standard Model and Beyond
• LHC signals of a BLSSM CP-even Higgs boson
• Higgs boson decays into γγ and Zγ in the MSSM and BLSSM
• Degenerate Higgs bosons decays to $\gamma \gamma$ and $Z\gamma$ in the type II Seesaw Model
• Effective Higgs Lagrangian and Constraints on Higgs Couplings
• Search for exotic decays of a Higgs boson into undetectable particles and one or more photons
• New Physics Scale from Higgs Observables with Effective Dimension-6 Operators
• Charged Lepton Flavor Violating Processes and Scalar Leptoquark Decay Branching Ratios in the Colored Zee-Babu Model
• Probing $HZ\gamma$ and $H\gamma \gamma$ Anomalous Couplings in the Process of $e^{+}{e}^{-}\to H\gamma$
• Cornering dimension-6 $HVV$ interactions at high luminosity LHC: the role of event ratios
• Radiative Decays of the Higgs Boson to a Pair of Fermions
• Constraints on CP-violating gauge-Higgs operators
• Exploring anomalous $HZ\gamma$ couplings in $\gamma$-proton collisions at the LHC
• Search for high-mass Z gamma resonances in proton-proton collisions at sqrt(s) = 8 and 13 TeV using jet substructure techniques
• Model-independent Probe of anomalous heavy neutral Higgs bosons at the LHC
• A UV Complete Compositeness Scenario: LHC Constraints Meet The Lattice
• Search for high-mass Z-gamma resonances in e+e-gamma and mu+mu-gamma final states in proton-proton collisions at sqrt(s) = 8 and 13 TeV
• Probing CP Violation in $h\to Z\gamma$ with Background Interference
• Searching for degenerate Higgs bosons - A profile likelihood ratio method to test for mass-degenerate states in the presence of incomplete data and uncertainties
• Higgs-like particle decays into $\gamma Z$ and $\gamma \gamma$ : Fingerprints of some non-supersymmetric models
• Prediction of $h\to \gamma Z$ from $h\to \gamma \gamma$ at LHC for the IMDS${}_3$ Model
• A Boost to $h\to Z\gamma$: from LHC to Future $e^{+}{e}^{-}$ Colliders
• Testing Higgs boson scenarios in the phenomenological NMSSM
• Anomalous $HZ\gamma$ couplings in photon-induced collisions at the LHC
• Large pseudoscalar Yukawa couplings in the complex 3HDM
• $ZZ\gamma$ production in the NLO QCD+EW accuracy at the LHC
• Characterizing simplified models for heavy Higgs decays to supersymmetric particles
• Revealing mass-degenerate states in Higgs boson signals
• Thermodynamic Prescription of Cosmological Constant in Randall Sundrum-II Brane
• Search for the Higgs boson decay to a $Z$ boson and a photon in $pp$ collisions at $\sqrt{s}=13$ TeV and $13.6$ TeV with the ATLAS detector
• Light dark matter around 100 GeV from the inert doublet model
• Exclusive rare Higgs decays into lepton pair and light mesons
• Lorentz-symmetry violation in the electroweak sector: scattering processes in future $e^{+}{e}^{-}$ colliders
• Higher-Order Corrections to Higgs Boson Amplitudes with Full Quark Mass Dependence in Quantum Chromodynamics
• Measurement of properties of the Higgs boson in bosonic decay channels using the ATLAS detector
• NNLO QCD predictions of the asymmetry probe of the $Z\gamma$ pair-production process