Same-sign Multilepton Signatures of an $SU(2{)}_R$ Quintuplet at the LHC

Abstract

We study in detail the collider signatures of an $SU(2{)}_R$ fermionic quintuplet in the framework of left-right symmetric model in the context of the 13 TeV LHC. Apart from giving a viable dark matter candidate (${\chi }^0$), this model provides unique collider imprints in the form of same-sign multileptons through the decays of multi-charged components of the quintuplet. In particular, we consider the scenario where the quintuplet carries $(B-L)=4$ charge, allowing for the presence of high charge-multiplicity particles with relatively larger mass differences among them compared to $(B-L)$ = 0 or 2. In this paper, we mainly focus on the same-sign n-lepton signatures (nSSL). We show that with an integrated luminosity of 500 $f{b}^{-1}$, the mass of the neutral component, $M_{{\chi }^0}\le 480(800)$ GeV can be excluded at 95\% CL in the 2SSL (3SSL) channel after imposing several selection criteria. We also show that a $5\sigma$ discovery is also achievable if $M_{{\chi }^0}\le 390(750)$ GeV in the 2SSL (3SSL) channel with 1000 $f{b}^{-1}$ integrated luminosity.

Comments: 24 pages, 7 tables, 12 figures. Comments are welcome. Some modifications in the text for better understanding. Few references added. Accepted in JHEP