Reinterpretation of ATLAS 8 TeV searches for Natural SUSY with a $R$-Sneutrino LSP

TL;DR

This paper reinterprets ATLAS 8 TeV search data to constrain natural supersymmetric models with a sneutrino as the lightest supersymmetric particle, providing bounds on chargino and stop masses.

Contribution

It extends the analysis of ATLAS data to models with a sneutrino LSP, offering new bounds on superpartner masses in these scenarios.

Findings

Charginos lighter than 300 GeV are constrained if sneutrinos are below 120 GeV.

Stops up to 300 GeV are excluded regardless of mixing angle.

No bounds are set for stops above 800 GeV.

Abstract

The data obtained by the LHC collaborations clearly show that supersymmetric models are not realized in nature in a vanilla form and that in particular strongly interacting supersymmetric particles are most likely heavier than expected. An exception are the partners of the third generation quarks, which also play a dominant role in the breaking of the electroweak symmetry. We consider here an extended class of so-called `natural supersymmetric models' where we allow for a sneutrino as the lightest supersymmetric particle as it appears for example in left-right symmetric models and/or models where supersymmetry is explained via an inverse seesaw mechanism. We evaluate how much existing ATLAS data constrain such scenarios and obtain roughly a bound of 300 GeV on the charginos if the sneutrinos are lighter than about 120 GeV. For the stop we find that only masses up to 300 GeV are excluded independent of the mixing angle. For larger values the exclusion depends on the detail of the scenario and if the mass exceeds 800 GeV no bound is obtained.