Search for lepton-flavor violating decays of heavy resonances and quantum black holes to eμ final states in proton-proton collisions at √s = 13 TeV

Abstract

Abstract: A search is reported for heavy resonances decaying into e nal states in proton-proton collisions recorded by the CMS experiment at the CERN LHC at p s = 13TeV, corresponding to an integrated luminosity of 35.9 fbð€€€1. The search focuses on resonance masses above 200 GeV. With no evidence found for physics beyond the standard model in the e mass spectrum, upper limits are set at 95% con dence level on the product of the cross section and branching fraction for this lepton- avor violating signal. Based on these results, resonant sneutrino production in R-parity violating supersymmetric models is excluded for masses below 1.7TeV, for couplings 132 = 231 = 0 311 = 0:01. Heavy Z0 gauge bosons with lepton- avor violating transitions are excluded for masses up to 4.4TeV. The e mass spectrum is also interpreted in terms of non-resonant contributions from quantum black-hole production in models with one to six extra spatial dimensions, and lower mass limits are found between 3.6 and 5.6TeV. In all interpretations used in this analysis, the results of this search improve previous limits by about 1TeV. These limits correspond to the most sensitive values obtained at colliders.