Signals of a Sneutrino (N)LSP at the LHC

TL;DR

This paper explores the collider signatures of sneutrino as the next-to-lightest supersymmetric particle at the LHC, highlighting distinctive multilepton signals that can differentiate it from other spectra.

Contribution

It identifies a family of sneutrino NLSP spectra with unique multilepton signals and develops analysis techniques to detect them at the LHC.

Findings

Distinctive multilepton signals for sneutrino NLSP identified

Analysis techniques for detecting sneutrino signals developed

Simulations show potential to distinguish sneutrino NLSP at the LHC

Abstract

The sneutrino is a viable candidate for the NLSP in SUSY spectra with gravitino LSP. In this work we study the collider implications of this possibility. In particular, we investigate whether the LHC can distinguish it (at least, in some cases) from alternative spectra, such as those with a neutralino LSP. We show that there exists a complete family of experimentally allowed and theoretically motivated spectra with sneutrino NLSP, which exhibit very distinctive multilepton signals that are difficult to fake within the MSSM. We study these signals in detail, including the techniques necessary to find them. We demonstrate our analysis approach on simulations incorporating backgrounds.