WW Same-Sign Double Parton Scattering

Data collected by the CMS detector of 13 TeV centre of mass proton-proton collisions, provided during run 2 of the LHC, constitutes an integrated luminosity of $12.9\,\mathrm{fb}^{-1}$. This provides a tool to probe a previously unmeasured process, double parton scattering (DPS) in same-sign WW. Leptonic decay to a muon and associated neutrino was selected for each W boson. In this manner complicated backgrounds were all but negated. A BDT was trained against the most kinematically similar background, and appropriate statistical measures were used to estimate the contribution of fake leptons from W+jets and, to a lesser extent, ttbar. An expected uncertainty on the signal of 52\% was extracted, or $2 \sigma$ significance. An in-progress analysis will determine a limit on the production cross section.