CMS kinematic edge from s-bottoms

TL;DR

This paper proposes two MSSM scenarios where s-bottoms decay to neutralinos and leptons, explaining the CMS 78 GeV dilepton edge, consistent with current limits and with implications for dark matter and muon g-2.

Contribution

It introduces two novel MSSM-based explanations for the CMS dilepton edge, detailing their collider signatures and dark matter implications.

Findings

Both scenarios fit the CMS excess and current experimental limits.

Predicted relic density aligns with observed dark matter density.

Models can be tested at the 13 TeV LHC run.

Abstract

We present two scenarios in the Minimal Supersymmetric Extension of the Standard Model (MSSM) that can lead to an explanation of the excess in the invariant mass distribution of two opposite charged, same flavor leptons, and the corresponding edge at an energy of about 78 GeV, recently reported by the CMS collaboration. In both scenarios, s-bottoms are pair produced, and decay to neutralinos and a b-jet. The heavier neutralinos further decay to a pair of leptons and the lightest neutralino through on-shell s-leptons or off-shell neutral gauge bosons. These scenarios are consistent with the current limits on the s-bottoms, neutralinos, and s-leptons. Assuming that the lightest neutralino is stable we discuss the predicted relic density as well as the implications for Dark Matter direct detection. We show that consistency between the predicted and the measured value of the muon anomalous magnetic moment may be obtained in both scenarios. Finally, we define the signatures of these models that may be tested at the 13 TeV run of the LHC.