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

This Letter describes a model-independent search for the production of new resonances in photon+jet(γ+jet) events using 20fb−1 of proton–proton LHC data recorded with the ATLAS detector at a centre-of-mass energy of √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 genericGaussian-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 4.6TeV and excited quarks are excluded below masses of 3.5TeV.