  Results are reported from a search for supersymmetry with gauge-mediated
supersymmetry breaking in electroweak production. Final states with photons and
large missing transverse energy (MET) were examined. The data sample was
collected in pp collisions at sqrt(s) = 8 TeV with the CMS detector at the LHC
and corresponds to 7.4 inverse femtobarns. The analysis focuses on scenarios in
which the lightest neutralino has bino- or wino-like components, resulting in
decays to photons and gravitinos, where the gravitinos escape undetected. The
data were obtained using a specially designed trigger with dedicated low
thresholds, providing good sensitivity to signatures with photons, MET, and low
hadronic energy. No excess of events over the standard model expectation is
observed. The results are interpreted using the model of general gauge
mediation. With the wino mass fixed at 10 GeV above that of the bino, wino
masses below 710 GeV are excluded at 95% confidence level. Constraints are also
set in the context of two simplified models, for which the analysis sets the
lowest cross section limits on the electroweak production of supersymmetric
particles.
