Search for new phenomena with photon+jet events in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

A search is performed for the production of high-mass resonances decaying into a photon and a jet in 3.2 fb${}^{-1}$ of proton--proton collisions at a centre-of-mass energy of $\sqrt{s}=13$ TeV collected by the ATLAS detector at the Large Hadron Collider. Selected events have an isolated photon and a jet, each with transverse momentum above 150 GeV. No significant deviation of the $\gamma +$jet invariant mass distribution from the background-only hypothesis is found. Limits are set at 95% confidence level on the cross sections of generic Gaussian-shaped signals and of a few benchmark phenomena beyond the Standard Model: excited quarks with vector-like couplings to the Standard Model particles, and non-thermal quantum black holes in two models of extra spatial dimensions. The minimum excluded visible cross sections for Gaussian-shaped resonances with width-to-mass ratios of 2% decrease from about 6 fb for a mass of 1.5 TeV to about 0.8 fb for a mass of 5 TeV. The minimum excluded visible cross sections for Gaussian-shaped resonances with width-to-mass ratios of 15% decrease from about 50 fb for a mass of 1.5 TeV to about 1.0 fb for a mass of 5 TeV. Excited quarks are excluded below masses of 4.4 TeV, and non-thermal quantum black holes are excluded below masses of 3.8 (6.2) TeV for Randall--Sundrum (Arkani-Hamed--Dimopoulous--Dvali) models with one (six) extra dimensions.

21 pages plus author list + cover pages (38 pages total), 5 figures. Submitted to JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2015-12/

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• Search for massive resonances decaying into WW, WZ, ZZ, qW, and qZ with dijet final states at $\sqrt{s}=$ 13 TeV
• Measurement of the cross section for isolated-photon plus jet production in $pp$ collisions at $\sqrt{s}=13$ TeV using the ATLAS detector
• Geometric model of black hole quantum $N$-portrait, extradimensions and thermodynamics
• Search for black holes and sphalerons in high-multiplicity final states in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Search for lepton flavour violating decays of heavy resonances and quantum black holes to an e-mu pair in proton-proton collisions at sqrt(s) = 8 TeV
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• Color-octet Companions of a 750 GeV Heavy Pion
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• Search for excited states of light and heavy flavor quarks in the $\gamma$+jet final state in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Higgs-photon resonances
• Electromagnetic absorption, emission and scattering spectra of black holes with tidal charge
• Dark Matter Candidates in a Visible Heavy QCD Axion Model
• Explaining the 750 GeV diphoton excess with a colored scalar charged under a new confining gauge interaction
• Jet-associated resonance spectroscopy
• Excited Quarks Production at FCC and S$pp$C $pp$ Colliders
• Enhanced color gauge invariance and a new di-photon state at the LHC
• Constraining scalar resonances with top-quark pair production at the LHC
• Probing a new strongly interacting sector via composite diboson resonances