Search for electroweak production of charginos and neutralinos in multilepton final states in proton-proton collisions at $\sqrt{s}=$ 13 TeV

TL;DR

This paper reports a search for electroweak production of charginos and neutralinos in multilepton final states at 13 TeV, setting new exclusion limits on their masses up to 1150 GeV based on CMS data.

Contribution

First comprehensive search for charginos and neutralinos in multilepton channels at 13 TeV, extending the mass exclusion range significantly compared to previous studies.

Findings

No significant excess over the standard model observed.

Masses between 180 GeV and 1150 GeV are excluded at 95% CL.

Results are compatible with various supersymmetry models.

Abstract

Results are presented from a search for the direct electroweak production of charginos and neutralinos in signatures with either two or more leptons (electrons or muons) of the same electric charge, or with three or more leptons, which can include up to two hadronically decaying tau leptons. The results are based on a sample of proton-proton collision data collected at $\sqrt{s} =$ 13 TeV, recorded with the CMS detector at the LHC, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. The observed event yields are consistent with the expectations based on the standard model. The results are interpreted in simplified models of supersymmetry describing various scenarios for the production and decay of charginos and neutralinos. Depending on the model parameters chosen, mass values between 180 GeV and 1150 GeV are excluded at 95% CL. These results significantly extend the parameter space probed for these particles in searches at the LHC. In addition, results are presented in a form suitable for alternative theoretical interpretations.