Search for physics beyond the standard model in final states with two opposite-charge same-flavor leptons, jets, and missing transverse momentum in pp collisions at 13 TeV

A search for phenomena beyond the standard model (BSM) is presented in final states with two opposite-charge same-flavor leptons, jets, and missing transverse momentum. The search is performed in a data sample of $\mathrm{p}\mathrm{p}$ collisions at $\sqrt{s}=13~\mathrm{TeV}$, collected by the CMS experiment at the LHC, and corresponding to an integrated luminosity of $137~\mathrm{fb}^{-1}$. Three potential signatures of BSM physics are explored: (i) an excess of events with a lepton pair whose invariant mass is consistent with the $\mathrm{Z}$ boson mass; (ii) a kinematic edge in the invariant mass distribution of the lepton pair; (iii) the non-resonant production of two leptons. The observed event yields are consistent with the predicted standard model backgrounds. The results are used to constrain models of BSM physics that result in the production of pairs of gluinos, squarks, sleptons, or charginos and neutralinos. Upper limits at $95\%$ CL are set on the production cross-section of supersymmetric particles. Searching for (i) allows to probe gluino masses up to $1875~\mathrm{GeV}$, as well as chargino (neutralino) masses up to $750~(800)~\mathrm{GeV}$; searching for (ii) allows to exclude light-flavor (bottom) squark masses up to $1800~(1600)~\mathrm{GeV}$; finally, by searching for (iii) slepton masses up to $650~\mathrm{GeV}$ can also be excluded.