Search for new physics in the one soft lepton final state using 2015 data at $\sqrt{s}=13~\mathrm{TeV}$

This note presents the results of a search for new physics using events with one soft lepton and large missing transverse momentum, inclusive in jet flavor and multiplicity. Results are based on a $2.3~\mathrm{fb}^{-1}$ data sample of $\sqrt{s} = 13~\mathrm{TeV}$ proton-proton collisions collected with the CMS detector. No significant deviations from the standard model expectations are observed, and the results are used to set limits on models featuring compressed spectra. For pair production of top squarks decaying into four bodies, $\widetilde{t} \rightarrow b \widetilde\chi^{0} l (q) \nu (q^\prime)$, top squark masses below 340 GeV are excluded for $m_{\widetilde{t}} - m_{\widetilde\chi^{0}} = 50~\mathrm{GeV}$. For gluino pair production decaying to $\widetilde{g} \rightarrow q\bar{q} \widetilde\chi^{\pm}$ followed by $\widetilde\chi^{\pm} \rightarrow W^{*} \widetilde\chi^{0}$, with $m_{\widetilde\chi^{\pm}} - m_{\widetilde\chi^{0}} = 20~\mathrm{GeV}$, gluino masses in the range $900-1200~\mathrm{GeV}$ are excluded for $\widetilde\chi^{0}$ masses in the range $100-800~\mathrm{GeV}$.