Leptophilic Signals of a Sneutrino (N)LSP and Flavor Biases from Flavor-Blind SUSY

TL;DR

This paper explores leptophilic sneutrino NLSP spectra in SUSY models, highlighting their distinctive collider signatures, including electron-muon asymmetries, which can mimic lepton flavor violation despite flavor-blind assumptions.

Contribution

It extends previous analyses to non-minimal sneutrino NLSP spectra, revealing their unique leptophilic collider signatures and potential for flavor asymmetries without flavor violation.

Findings

Sneutrino NLSP spectra exhibit leptophilic behavior observable at the LHC.

Certain spectra produce strong electron-muon asymmetries.

Signals can mimic lepton flavor violation even with flavor-blind SUSY.

Abstract

Although the sneutrino is a viable NLSP candidate with gravitino LSP, spectra of this type occupy a part of SUSY parameter space in which collider signatures are poorly studied. In this paper we will extend previous work on this topic to include sneutrino NLSP spectra with non-minimal phenomenology. Generally, these spectra exhibit very leptophilic behavior, which can be easily observed at the LHC. We show that a variety of such spectra can be analysed with similar techniques, leading in each case to very suggestive evidence for complicated decay chains that end in sneutrinos. Amongst the variations considered, we find a simple class of spectra that produce signals with strong electron-muon asymmetries. These signals could naively be interpreted as evidence for lepton flavor violation, but can occur even with flavor-blind SUSY.