Search for new phenomena in photon+jet events collected in proton–proton collisions at s = 8 TeV with the ATLAS detector

Journal Article · Wed Jan 01 00:00:00 EST 2014 · Physics Letters B

DOI:https://doi.org/10.1016/j.physletb.2013.12.029· OSTI ID:1209724

This Letter describes a model-independent search for the production of new resonances in photon + jet (γ + jet) events using 20 fb^-1 of proton-proton LHC data recorded with the ATLAS detector at a centre-of-mass energy of $$ \sqrt{s}$$ = 8 TeV. The γ + jet mass distribution is compared to a background model fit from data; no significant deviation from the background-only hypothesis is found. Limits are set at 95% credibility level on generic Gaussian-shaped signals and two benchmark phenomena beyond the Standard Model: non-thermal quantum black holes and excited quarks. Non-thermal quantum black holes are excluded below masses of 4.6 TeV and excited quarks are excluded below masses of 3.5 TeV.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE
• Contributing Organization: ATLAS Collaboration
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 1209724
• Alternate ID(s): OSTI ID: 1523892
• Journal Information: Physics Letters B, Vol. 728, Issue C; ISSN 0370-2693
• Publisher: Elsevier
• Country of Publication: Netherlands
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS