Search for heavy resonances decaying to a $Z$ boson and a photon in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

This Letter presents a search for new resonances with mass larger than 250 GeV, decaying to a $Z$ boson and a photon. The dataset consists of an integrated luminosity of 3.2 fb${}^{-1}$ of $pp$ collisions collected at $\sqrt{s}=13$ TeV with the ATLAS detector at the Large Hadron Collider. The $Z$ bosons are identified through their decays either to charged, light, lepton pairs ($e^{+}{e}^{-}$, ${\mu }^{+}{\mu }^{-}$) or to hadrons. The data are found to be consistent with the expected background in the whole mass range investigated and upper limits are set on the production cross section times decay branching ratio to $Z\gamma$ of a narrow scalar boson with mass between 250 GeV and 2.75 TeV.

arXiv comment18 pages plus author list + cover pages (36 pages total), 4 figures, 0 tables, published in Phys. Lett. B, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2016-02/

References in corpus (44)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• The anti-k_t jet clustering algorithm
• A Brief Introduction to PYTHIA 8.1
• Parton distributions for the LHC
• Big-Bang Nucleosynthesis
• Asymptotic formulae for likelihood-based tests of new physics
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• New parton distributions for collider physics
• Event generation with SHERPA 1.1
• The ATLAS Simulation Infrastructure
• Scattering Amplitudes with Open Loops
• A parton shower algorithm based on Catani-Seymour dipole factorisation
• Successive Combination Jet Algorithm For Hadron Collisions
• Comix, a new matrix element generator
• QCD matrix elements + parton showers: The NLO case
• QCD matrix elements and truncated showers
• Jet Trimming
• Muon reconstruction performance of the ATLAS detector in proton--proton collision data at $\sqrt{s}$=13 TeV
• Topological cell clustering in the ATLAS calorimeters and its performance in LHC Run 1
• Improved luminosity determination in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector at the LHC
• Jet energy measurement with the ATLAS detector in proton-proton collisions at sqrt(s) = 7 TeV
• ZZ production at hadron colliders in NNLO QCD
• Energy Correlation Functions for Jet Substructure
• Measurement of the $Z/{\gamma }^{\ast }$ boson transverse momentum distribution in $pp$ collisions at $\sqrt{s}$ = 7 TeV with the ATLAS detector
• Measurement of Higgs boson production in the diphoton decay channel in $pp$ collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector
• NLO matrix elements and truncated showers
• Higgs production via gluon fusion in the POWHEG approach in the SM and in the MSSM
• Measurement of the inclusive isolated prompt photon cross section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Search for massive resonances decaying into pairs of boosted bosons in semi-leptonic final states at sqrt(s) = 8 TeV
• Search for diphoton resonances in the mass range from 150 to 850 GeV in pp collisions at sqrt(s) = 8 TeV
• Search for resonances in diphoton events at $\sqrt{s}$=13 TeV with the ATLAS detector
• Search for high-mass diphoton resonances in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Measurement of isolated-photon pair production in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run-1 data
• $Z\gamma$ production at hadron colliders in NNLO QCD
• Search for high-mass diphoton resonances in proton-proton collisions at 13 TeV and combination with 8 TeV search
• Measurements of Wgamma and Zgamma production in pp collisions at sqrt{s}= 7 TeV with the ATLAS detector at the LHC
• Low-Scale Technicolor at the Tevatron and LHC
• Identification of boosted, hadronically decaying W bosons and comparisons with ATLAS data taken at $\sqrt{s}=8$ TeV
• Search for new phenomena in photon+jet events collected in proton--proton collisions at sqrt(s) = 8 TeV with the ATLAS detector
• Combination of searches for $WW$, $WZ$, and $ZZ$ resonances in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Singlet scalars as Higgs imposters at the Large Hadron Collider
• Search for exotic resonances decaying into WZ/ZZ in pp collisions at sqrt(s) = 7 TeV
• Search for a scalar or vector particle decaying into Zgamma in ppbar collisions at sqrt(s) = 1.96 TeV

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• Current status of MSSM Higgs sector with LHC 13 TeV data
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• Hadron Collider Searches for Diboson Resonances
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• LHC Future Prospects of the 750 GeV Resonance
• Update on 750 GeV diphotons from closed string states
• Direct Constraints, Flavor Physics, and Flavor Anomalies in Composite Higgs Models
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• Cornering diphoton resonance models at the LHC
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