Right sneutrinos and the signals of a stable stop at the Large Hadron Collider

TL;DR

This paper explores the detection of stable stop particles at the LHC in a supersymmetric model with a right-chiral sneutrino LSP, proposing specific signals and methods for mass reconstruction.

Contribution

It introduces a scenario with a stable stop NLSP and demonstrates how to identify signals and reconstruct gluino mass at the LHC using kinematic cuts and detector signals.

Findings

Stable stop NLSP can produce charged tracks detectable at the LHC.

Proper kinematic cuts effectively suppress backgrounds in stop and gluino signals.

Mass of the gluino can be reconstructed from visible NLSP tracks.

Abstract

We investigate charged tracks signals of a supersymmetric scenario, where the lighter stop is the next-to-lightest supersymmetric particle (NLSP). It is found that such an NLSP is stable on the scale of the detector at the LHC if one has a right-chiral sneutrino as the lightest supersymmetric particle (LSP). After identifying some benchmark points in the parameter space of a supergravity scenario with non-universal scalar masses, we study a few specific classes of signals, namely, stop pair production and gluino pair production followed by each decaying into a stop and a top. It is shown that proper kinematic cuts remove the backgrounds in each case, and, while a few months' worth of data is sufficient to have copious events in the first case, one may require 300 $fb^{-1}$ for the other. One can also aspire to reconstruct the gluino mass, using the `visible' stable NLSP tracks.