Search for R-parity violating supersymmetry and quantum black-holes in e+mu final state in CMS

A search for narrow resonances decaying to an electron and a muon is performed using an integrated luminosity of 2.7 fb$^{-1}$ of 13 TeV proton-proton collision data recorded with the CMS detector at the LHC. The e$\mu$ mass spectrum is also investigated for non-resonant contributions from the production of quantum black holes (QBH). With no evidence for physics beyond the standard model in the invariant mass spectrum of selected e$\mu$ pairs, upper limits are set at 95\% confidence level on the product of cross section and branching fraction for signals arising in theories with charged lepton flavour violation. In the search for narrow resonances, the resonant production of a $\tau$ sneutrino in R-parity violating supersymmetry is considered. The $\tau$ sneutrino is excluded for masses below 1.0 TeV for couplings $\lambda_{132} = \lambda_{231} = \lambda'_{311} = 0.01$ and below 3.3 TeV for $\lambda_{132} = \lambda_{231} = \lambda'_{311} = 0.2$. In a framework of TeV-scale quantum gravity, for models that invoke extra dimensions, the observed exclusion limits for the threshold mass of QBH production range from 2.5 TeV for one extra dimension to 4.5 TeV for six extra dimensions.