Long-lived triplinos and displaced lepton signals at the LHC

TL;DR

This paper investigates long-lived tripletino superpartners in a supersymmetric model, focusing on their unique displaced lepton signals at the LHC due to compressed spectra and suppressed couplings.

Contribution

It introduces a novel supersymmetric scenario with tripletinos that produce displaced leptonic signatures, and performs detailed simulations of their collider phenomenology.

Findings

Displaced leptonic signals can be prominent in the model.

Compressed spectra lead to soft decay products that evade current bounds.

Simulation results suggest detectable signals at the 14 TeV LHC.

Abstract

We explore the possibility of having superpartners of triplet Higgs bosons, named as 'triplinos'. They form a part of light neutralinos and charginos in a $Y=0$ extended supersymmetric Standard Model. For this model such electroweakinos do not have direct couplings to the Standard Model fermions. On top of that, due to very compressed spectrum for lighter neutralinos and charginos, their decay products coming from three body decays are very soft and thus can evade the current collider bounds. These decays are particularly interesting since they give rise to displaced leptonic signatures. We categorise the parameter space, while exploring different displaced decay possibilities. A PYTHIA based simulation has been performed to find out the displaced charged lepton, jet and $b$-jet final states at the LHC with center of mass energy of 14 TeV.