Right-Chiral Sneutrino LSP in mSUGRA: Event characteristics of NLSP at the LHC

TL;DR

This paper explores a supersymmetric model where a right-chiral sneutrino is the LSP and the stau is the NLSP, leading to distinctive long-lived stau tracks at the LHC that can be distinguished from muons.

Contribution

It introduces a novel supersymmetric scenario with a right-chiral sneutrino LSP and analyzes the unique collider signatures of long-lived staus at the LHC.

Findings

Long-lived staus produce detectable tracks in muon chambers.

Proper kinematic cuts can distinguish stau tracks from muons.

Standard model backgrounds can be effectively removed.

Abstract

We study a supersymmetric scenario where the lighter tau-sneutrino is the lightest supersymmetric particle, while the lighter stau-state is the next lightest. Such a scenario can be motivated within the framework of minimal supergravity, with just the addition of a right-chiral neutrino superfield. Such a spectrum leads to rather unusual signals of supersymmetry, showing stable tracks of the stau in the muon chambers. We study the event characteristics of the long-lived staus at the LHC and demonstrate that the stau tracks can be distinguished from the muonic ones through proper kinematic cuts which also enable one to remove all standard model backgrounds.