Search for Z' bosons decaying into charginos in final states with two oppositely charged leptons and missing transverse momentum in pp collisions at $\sqrt{s}$ = 13 TeV

TL;DR

This paper searches for leptophobic Z' bosons decaying into charginos in proton-proton collisions at 13 TeV, using neural networks to analyze CMS data, and sets mass exclusion limits up to 3.5 TeV.

Contribution

It introduces a novel search for Z' bosons decaying to charginos using neural networks and sets new exclusion limits based on CMS data.

Findings

No significant excess over the standard model observed.

Excludes Z' boson masses up to 3.5 TeV for specific decay channels.

Provides constraints on supersymmetric extensions with additional U(1)' symmetry.

Abstract

Massive leptophobic Z' bosons decaying to a pair of charginos are searched for in proton-proton collisions at $\sqrt{s}$ = 13 TeV, using data samples collected by the CMS experiment in 2016, 2017, and 2018, corresponding to a total integrated luminosity of 138 fb$^{-1}$. The Z' bosons originate from an additional U(1)' gauge symmetry extended to the minimal supersymmetric standard model. The final state consists of two oppositely charged leptons and missing transverse momentum. The signal extraction is performed with a parametrized neural network. The measurements are found to be consistent with the standard model expectations. Upper limits are set on the Z' boson production cross sections as a function of the Z' and chargino masses. The analysis excludes Z' boson masses up to about 3.5 TeV for the specific case of Z' bosons decaying exclusively to charginos, with the charginos decaying to W bosons and neutralinos.