Search for supersymmetry in final states with two oppositely charged same-flavor leptons and missing transverse momentum in proton-proton collisions at $\sqrt{s} =$ 13 TeV

TL;DR

This paper reports a search for supersymmetry in proton-proton collision data at 13 TeV, finding no deviations from the standard model and setting exclusion limits on various supersymmetric particle masses.

Contribution

First CMS search to analyze multiple supersymmetry signatures with 137 fb$^{-1}$, setting new exclusion limits on gluino, squark, chargino, neutralino, and slepton masses.

Findings

No significant excess observed over standard model predictions.

Excluded gluino masses up to 1870 GeV at 95% CL.

Excluded squark, chargino, neutralino, and slepton masses within certain SUSY models.

Abstract

A search for phenomena beyond the standard model in final states with two oppositely charged same-flavor leptons and missing transverse momentum is presented. The search uses a data sample of proton-proton collisions at $\sqrt{s} =$ 13 TeV, corresponding to an integrated luminosity of 137 fb$^{-1}$, collected by the CMS experiment at the LHC. Three potential signatures of physics beyond the standard model are explored: an excess of events with a lepton pair, whose invariant mass is consistent with the Z boson mass; a kinematic edge in the invariant mass distribution of the lepton pair; and the nonresonant production of two leptons. The observed event yields are consistent with those expected from standard model backgrounds. The results of the first search allow the exclusion of gluino masses up to 1870 GeV, as well as chargino (neutralino) masses up to 750 (800) GeV, while those of the searches for the other two signatures allow the exclusion of light-flavor (bottom) squark masses up to 1800 (1600) GeV and slepton masses up to 700 GeV, respectively, at 95% confidence level within certain supersymmetry scenarios.