Probing dark matter and CMSSM with same-sign dilepton searches at the LHC

TL;DR

This paper introduces new observables based on dilepton ratios at the LHC to better probe dark matter models, specifically applied to the CMSSM's stau coannihilation region, aiding in constraining its parameter space.

Contribution

The paper proposes novel dilepton ratio observables that are less sensitive to energy variations, providing a new method to constrain the CMSSM parameter space using LHC data.

Findings

New dilepton ratio variables depend mildly on collision energy.

These variables can effectively constrain the CMSSM parameter space.

Application to the stau coannihilation region demonstrates their utility.

Abstract

We introduce new observables for the study of the inclusive same sign dileptons production at LHC which are built out of ratios of the observed number of same-sign dileptons, both with same $N(\ell,\ell)$ and different flavor $N(\ell,\ell')$. As a case study we apply them to the stau coannihilation region of the constrained minimal supersymmetric standard model. We show that the new variables depend rather mildly on the center of mass energy and how these can be used to constraint the parameter space in the $(m_{1/2},\tan\beta)$ plane.