Search for top squarks in R-parity-violating supersymmetry using three or more leptons and b-tagged jets

TL;DR

This paper searches for signs of top squarks in R-parity-violating supersymmetry using events with multiple leptons and b-tagged jets, finding no excess but setting mass exclusion limits.

Contribution

It provides the first search for top squarks with R-parity-violating decays in multilepton final states at 8 TeV, establishing new mass exclusion limits.

Findings

No excess above standard model expectations observed.

Excluded top-squark masses below 1020 GeV and 820 GeV for two models.

Set new constraints on R-parity-violating supersymmetry.

Abstract

A search for anomalous production of events with three or more isolated leptons and bottom-quark jets produced in pp collisions at sqrt(s) = 8 TeV is presented. The analysis is based on a data sample corresponding to an integrated luminosity of 19.5 inverse femtobarns collected by the CMS experiment at the LHC in 2012. No excess above the standard model expectations is observed. The results are interpreted in the context of supersymmetric models with signatures that have low missing transverse energy arising from light top-squark pair production with R-parity-violating decays of the lightest supersymmetric particle. In two models with different R-parity-violating couplings, top-squarks are excluded below masses of 1020 GeV and 820 GeV when the lightest supersymmetric particle has a mass of 200 GeV.