Enhanced Tau Lepton Signatures at LHC in Constrained Supersymmetric Seesaw

TL;DR

This paper explores how the LHC could observe increased tau lepton events in a constrained supersymmetric seesaw model, especially when the left-handed stau doublet is lighter, affecting supersymmetric particle signatures.

Contribution

It introduces a scenario where the left-handed stau doublet is lighter due to large neutrino Yukawa effects, enhancing tau signatures at LHC within a specific supersymmetric framework.

Findings

Enhanced tau lepton signals at LHC in certain parameter regions.

Identification of sneutrino and stau coannihilation regions consistent with WMAP data.

Light left-handed stau doublet influences supersymmetric particle decay signatures.

Abstract

We discuss the possible enhancement of the tau lepton events at LHC when the left-handed stau doublet becomes light (which can be even lighter than the right-handed stau). This is illustrated in the constrained supersymmetric seesaw model where the slepton doublet mass is suppressed by the effects of a large neutrino Yukawa coupling. We study a few representative parameter sets in the sneutrino coannihilation regions where the tau sneutrino is NLSP and the stau coannihilation regions where the stau is NLSP both of which yield the thermal neutralino LSP abundance determined by WMAP.