Search for resonant production of second generation sleptons with same-sign dimuon events in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$

A search for resonant production of second generation sleptons ($\tilde{\mu}$, $\tilde{\nu}_{\mu}$) via the R-parity-violating coupling $\lambda'_{211}$, in events with two same-sign muons and at least two jets in the final state is presented. While one muon is expected to be produced directly in the slepton decay, the second muon and at least two jets are produced in the subsequent decay of a neutralino or chargino originating from the resonant slepton. The analysis is based on the 2016 dataset of proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$ recorded with the CMS detector at the CERN LHC, which corresponds to an integrated luminosity of $35.9~\mathrm{fb}^{-1}$. No significant deviation is observed with respect to standard model expectations. Upper cross section limits are derived in the context of two simplified models representing the dominant signal contributions. The cross section limits are translated into coupling limits for a modified constrained minimal supersymmetric model with $\lambda'_{211}$ as an additional R-parity-violating coupling. The results impose significantly extended restrictions of the parameter space compared to previous searches for similar models.