CMS kinematic edge from sbottoms

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, sbottoms 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 sleptons or off-shell neutral gauge bosons. These scenarios are consistent with the current limits on the sbottoms, neutralinos, and sleptons. 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.

Figure 1

A spectrum that could account for the dilepton kinematic edge. ${\tilde{\chi }}_2^0$ decays to the LSP and a pair of same flavor, opposite sign dileptons through a light slepton.

Figure 2

Invariant mass distribution of the same flavor, opposite sign dileptons. See the spectrum in Fig. 1 and Table 1.

Figure 3

A spectrum that could account for the dilepton kinematic edge. ${\tilde{\chi }}_2^0$ and ${\tilde{\chi }}_3^0$ decay to the LSP and a pair of same flavor, opposite sign leptons through an off-shell Z.

Figure 4

Invariant mass distribution of the same flavor, opposite sign dileptons. The edge is located at the mass difference between the Higgsinos and ${\tilde{\chi }}_1^0$. See the spectra in Fig. 3 and Table 1.