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

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

ATLAS

Collaboration

Dec 18, 2015

38 pages

Published in:

JHEP 03 (2016) 041

Published: Mar 8, 2016

e-Print:

1512.05910 [hep-ex]

DOI:

10.1007/JHEP03(2016)041

PDG: Production Cross Section of Radiatively-Decaying Neutral Particle

Report number:

CERN-PH-EP-2015-320

Experiments:

CERN-LHC-ATLAS

View in:

reference search56 citations

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Abstract: (Springer)

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 γ+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.

Note:

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/

Hadron-Hadron scattering
p p: scattering
p p: colliding beams
black hole: quantum
final state: (jet photon)
quark: excited state
quark: vector particle
ATLAS
transverse momentum
space-time: higher-dimensional

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