Abstract
Abstract:
A search is presented for photonic signatures, motivated by generalized models of gauge-
mediated supersymmetry breaking. This search makes use of proton–proton collision data at
√s = 13 TeV corresponding to an integrated luminosity of 36.1 fb−1 recorded by the ATLAS
detector at the LHC, and it explores models dominated by both strong and electroweak pro- duction
of supersymmetric partner states. Experimental signatures incorporating an isolated photon and
significant missing transverse momentum are explored. These signatures include events with an
additional photon or additional jet activity not associated with any specific underlying quark
flavor. No significant excess of events is observed above the Standard Model prediction, and 95%
confidence-level upper limits of between 0.083 fb and 0.32 fb are set on the visible cross section
of contributions from physics beyond the Standard Model. These results are interpreted in terms of
lower limits on the masses of gluinos, squarks, and gauginos in the context of generalized models
of gauge-mediated supersymmetry, which reach as high as 2.3 TeV for strongly produced and 1.3 TeV
for weakly produced supersymmetric partner
pairs.