A search is performed for the production of high-mass resonances decaying into a photon and a jet in 3.2 fb1 of proton-proton collisions at a centre-of-mass energy of \sqrt s = 13TeV 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 signicant deviation of the +jet invariant mass distribution from the backgroundonly hypothesis is found. Limits are set at 95% condence 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 nonthermal 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 1.5TeV to about 0.8 fb for a mass of 5TeV. The minimum excluded visible cross sections for Gaussian-shaped resonances with widthto- mass ratios of 15% decrease from about 50 fb for a mass of 1.5TeV to about 1.0 fb for a mass of 5TeV. Excited quarks are excluded below masses of 4.4TeV, 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.

Search for new phenomena with photon+jet events in proton-proton collisions at √s = 13 TeV with the ATLAS detector

CONTA, CLAUDIO;DONDERO, PAOLO;FRATERNALI, MARCO;INTROZZI, GIANLUCA;LIVAN, MICHELE;NEGRI, ANDREA;REBUZZI, DANIELA MARCELLA;RIMOLDI, ADELE;
2016-01-01

Abstract

A search is performed for the production of high-mass resonances decaying into a photon and a jet in 3.2 fb1 of proton-proton collisions at a centre-of-mass energy of \sqrt s = 13TeV 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 signicant deviation of the +jet invariant mass distribution from the backgroundonly hypothesis is found. Limits are set at 95% condence 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 nonthermal 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 1.5TeV to about 0.8 fb for a mass of 5TeV. The minimum excluded visible cross sections for Gaussian-shaped resonances with widthto- mass ratios of 15% decrease from about 50 fb for a mass of 1.5TeV to about 1.0 fb for a mass of 5TeV. Excited quarks are excluded below masses of 4.4TeV, 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/1122722
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