Using the $e^\pm \mu^\mp + E^{miss}_T$ and $l^+l^- + E^{miss}_T$ Signatures in the Search for Supersymmetry and Constraining the MSSM model at LHC

TL;DR

This paper investigates specific dilepton signatures in supersymmetry searches at the LHC, analyzing how different parameters affect observable spectra and proposing that certain signatures are more promising for discovery.

Contribution

It introduces an analysis of dilepton plus missing energy signatures across various MSSM parameter modifications, highlighting the impact of gaugino-higgsino mass relations on detection prospects.

Findings

Dilepton mass spectra shape varies with $ aneta$ in mSUGRA.

Lepton event counts are sensitive to gaugino-higgsino mass relations.

Single jet plus missing energy signature remains robust for SUSY discovery.

Abstract

We study the $e^{\pm}\mu^{\mp} + E^{miss}_T$ and $l^+l^- + E^{miss}_T$ signatures $(l = e, \mu)$ for different values of $\tan\beta$ in the mSUGRA model. With $\tan\beta$ rising, we observe a characteristic change in the shape of dilepton mass spectra in $l^+l^- + E^{miss}_T $ versus $e^{\pm}\mu^{\mp}$ final states reflecting the decrease of $\tilde{\chi}^0_2 \to l^+l^- \tilde{\chi^0_1}$ branching ratio. We also study the non mSUGRA modifications of the CMS test point LM1 with arbitrary relations among gaugino and higgsino masses. For such modifications of the mSUGRA test point LM1 the number of lepton events depends rather strongly on the relations among gaugino and higgsino masses and in some modifications of the test point LM1 the signatures with leptons and $E_{T}^{miss}$ do not lead to the SUSY discovery and the single SUSY discovery signature remains the signature with $n \geq 2 jets + E^{miss}_T + no leptons$.