MSSM dark matter and a light slepton sector: The incredible bulk

Abstract

Recent experimental results from the LHC have placed strong constraints on the masses of colored superpartners. The MSSM parameter space is also constrained by the measurement of the Higgs boson mass, and the requirement that the relic density of lightest neutralinos be consistent with observations. Although large regions of the MSSM parameter space can be excluded by these combined bounds, leptophilic versions of the MSSM can survive these constraints. In this paper we consider a scenario in which the requirements of minimal flavor violation, vanishing CP -violation, and mass universality are relaxed, specifically focusing on scenarios with light sleptons. We find a large region of parameter space, analogous to the original bulk region, for which the lightest neutralino is a thermal relic with an abundance consistent with that of dark matter. We find that these leptophilic models are constrained by measurements of the magnetic and electric dipole moments of the electron and muon, and that these models have interesting signatures at a variety of indirect detection experiments.

Testing the light dark matter scenario of the MSSM at the LHC

“…At this stage, we'd like to clarify the differences of our study from previous literatures [37] and [42,43]. In [37], the authors scanned the parameter space of the MSSM by relaxing the slepton masses to get the light DM scenario, which is quite similar to what we did in this work.…”

“…Another difference of [43] from our work is that the work [43] only considered the trilepton signal to limit the light DM scenario, while we combine the dilepton and trilepton signals to limit the scenario. Moreover, we note that the scenario featured by predicting light bino and sleptons, which is somewhat similar to Type-I samples in this work, was previously studied in [42]. However, our study differs from the work [42] in at least two aspects.…”

“…Moreover, we note that the scenario featured by predicting light bino and sleptons, which is somewhat similar to Type-I samples in this work, was previously studied in [42]. However, our study differs from the work [42] in at least two aspects. One is that the authors of [42] focused on the constraints from the magnetic and electric dipole moments of the electron and muon on the scenario, and they omitted the limitation from the direct search for sleptons at the LHC.…”

“…However, our study differs from the work [42] in at least two aspects. One is that the authors of [42] focused on the constraints from the magnetic and electric dipole moments of the electron and muon on the scenario, and they omitted the limitation from the direct search for sleptons at the LHC. By contrast, we require our samples to explain the measured value of the muon magnetic moment, and pay great effort to examine the constraints of the direct search for the sleptons.…”

“…By contrast, we require our samples to explain the measured value of the muon magnetic moment, and pay great effort to examine the constraints of the direct search for the sleptons. The other is that the authors of [42] considered the case where there exists large mass splittings between sleptons. In such a situation, the s-wave contribution to the DM annihilation today can be sizable, so they intensively discussed interesting DM signatures at a variety of indirect detection experiments.…”