A search for new physics in final states consisting of at least one photon,
multiple jets, and large missing transverse momentum is presented, using proton-proton
collision events at a center-of-mass energy of 13TeV. The data correspond to an integrated
luminosity of 137 fb−1, recorded by the CMS experiment at the CERN LHC from 2016 to
2018. The events are divided into mutually exclusive bins characterized by the missing
transverse momentum, the number of jets, the number of b-tagged jets, and jets consistent
with the presence of hadronically decaying W, Z, or Higgs bosons. The observed data are
found to be consistent with the prediction from standard model processes. The results are
interpreted in the context of simplified models of pair production of supersymmetric particles
via strong and electroweak interactions. Depending on the details of the signal models,
gluinos and squarks of masses up to 2.35 and 1.43TeV, respectively, and electroweakinos
of masses up to 1.23TeV are excluded at 95% confidence level.
