Probing bino NLSP at lepton colliders

TL;DR

This paper explores the potential to detect light bino NLSPs at future lepton colliders via pair production and decay into gravitino or axino, providing sensitivity beyond current LHC capabilities.

Contribution

It analyzes the collider signatures of bino NLSPs with gravitino or axino LSPs at future lepton colliders, highlighting their discovery prospects and parameter space reach.

Findings

Bino masses around 100 GeV can be probed at 2σ with a 3 ab^{-1} luminosity.

Bino masses around 10 GeV can be probed beyond LHC reach.

Slepton masses up to 2 TeV (1.5 TeV) for 100 GeV bino at 2σ (5σ).

Abstract

We consider a scenario where light bino is the next-to-lightest supersymmetric particle (NLSP) and gravitino/axino is the lightest superysmmetric particle (LSP). For a bino mass less than or around hundred GeV, it can be pair produced at the future lepton colliders through $t-$channel slepton exchange, subsequently decaying into a gravitino/axino plus a photon. We study the prospects to look for such binos at the future colliders and find that a bino mass around 100 GeV can be probed at the $2\sigma$ ($5\sigma$) level for a slepton below 2 TeV (1.5 TeV) with a luminosity 3 $ab^{-1}$. For a bino mass around 10 GeV, a slepton mass less than 4 TeV (3 TeV) can be probed at the $2\sigma$ ($5\sigma$) level, which is much beyond the reach of the LHC for direct slepton searches.