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Title

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

CollaborationWith : Ancu, Lucian Stefan / Bell, William / Bilbao De Mendizabal, Javier / Calace, Noemi / Clark, Allan Geoffrey / Coccaro, Andrea / Delitzsch, Chris Malena / Della Volpe, Domenico / Ferrere, Didier / Gadomski, Szymon / Golling, Tobias / Gonzalez Sevilla, Sergio / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / March Ruiz, Luis / Mermod, Philippe / Miucci, Antonio / Nackenhorst, Olaf / Nessi, Marzio / Paolozzi, Lorenzo / Ristic, Branislav / Schramm, Steven / Sfyrla, Anna / Vallecorsa, Sofia / Wu, Xin
Published in Journal of High Energy Physics. 2016, vol. 1603, p. 041-78
Collection Open Access - SCOAP3
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 √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.
Keywords Hadron-Hadron scattering
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arXiv: 1512.05910
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ATLAS COLLABORATION. Search for new phenomena with photon+jet events in proton-proton collisions at √s = 13 TeV with the ATLAS detector. In: Journal of High Energy Physics, 2016, vol. 1603, p. 041-78. https://archive-ouverte.unige.ch/unige:82204

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Deposited on : 2016-04-01

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