addition, to avoid effects related to jet mismeasurement that can contribute to spurious , we require the to have a minimum separation of 0.25 in $\abs{\Delta \phi}$ from jets with $\pt > 30\GeV$ and $\abs{\eta} < 2.4$, as well as from those with uncorrected $\pt > 50\GeV$ in the region $2.4 < \abs{\eta} < 3.14$.

Events satisfying the baseline selection criteria are subdivided into exclusive SRs using several discriminants. To improve the discrimination of signal from SM background, we take advantage of the expected presence of two in the final state of signal events and their contribution to . Their presence skews the correlations between and the reconstructed leptons to be different from background processes, even for those backgrounds with genuine . These differences can be exploited by mass observables calculated from the reconstructed lepton transverse momenta and to provide discrimination of signal from background. For a particle decaying to a visible and an invisible particle, the transverse mass () calculated from the of the visible decay products should have a kinematic endpoint at the mass of the parent particle. Assuming that the corresponds to the of the invisible particle, we calculate the observable for the visible particle q and 