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Compact Muon Solenoid
LHC, CERN

CMS-PAS-EXO-19-005
Search for long-lived particles using delayed photons with proton-proton collisions at $\sqrt{s}= $ 13 TeV
Abstract: A search for new physics with long-lived particles decaying to photons is presented using proton-proton collisions data at $\sqrt{s}= $ 13 TeV collected by the CMS experiment in 2016 and 2017 corresponding to 35.9 fb$^{-1}$ and 41.5 fb$^{-1}$ of integrated luminosity, respectively. Results are interpreted in the context of supersymmetry with gauge-mediated supersymmetry breaking, where long-lived neutralinos are produced as secondaries and decay to a photon and a gravitino. Limits are presented as a function of the neutralino proper decay length and mass. For neutralino proper decay lengths of 10$^{1}$, 10$^{2}$, 10$^{3}$, and 10$^{4} $ cm, masses up to 320, 525, 360, and 215 GeV are excluded at 95% CL, respectively. We extend the previous best limits in the neutralino proper decay length by up to about one order of magnitude, and in neutralino mass by up to about 100 GeV.
CMS Publications
Compact Muon Solenoid
LHC, CERN