Abstract
Abstract:
A search is performed for new phenomena in events having a photon with high transverse
momentum and a jet collected in 36.7 fb−1 of proton–proton collisions at a centre-of-mass energy of
√s = 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. The
invariant mass distribution of the leading photon and jet is examined to look for the reson- ant
production of new particles or the presence of new high-mass states beyond the Stand- ard Model. No
significant deviation from the background-only hypothesis is observed and cross-section limits for
generic Gaussian-shaped resonances are extracted. Excited quarks hypothesized in quark
compositeness models and high-mass states predicted in quantum black hole models with extra
dimensions are also examined in the analysis. The observed data exclude, at 95% confidence level,
the mass range below 5.3 TeV for excited quarks and 7.1 TeV (4.4 TeV) for quantum black holes in
the Arkani-Hamed–Dimopoulos–Dvali
(Randall–Sundrum) model with six (one) extra dimensions.