Abstract
Recently ATLAS reported a $3.3\sigma$ excess in the stop search with $\ell+jets+E_T^{miss}$ channel. We try to interpret the signal by a light stop pair production in the MSSM. We find: (1) simple models where stop decays into a higgsino or a bino are not favored. (2) an extension of them can explain the data at $2\sigma$ level without conflicting with the other search channels. A surviving possibility includes a light stop and a light higgsino, which is expected in a natural SUSY scenario.
Highlights
Supersymmetry (SUSY) is one of the most fascinating models beyond the Standard Model (SM), which can simultaneously solve the naturalness problem, explain the cosmic dark matter and achieve the gauge coupling unification
With the recent 13 fb−1 dataset of LHC, a gluino and a stop lighter than 1.8 TeV and 900 GeV have been excluded out respectively if the mass splitting between the stop and the lightest supersymmetric particle (LSP) is large enough, and the mass of an electroweakino has been excluded to 0.4-1 TeV depending on the decay mode
We study the interpretation of the excesses as light stop pair production in the minimal supersymmetric standard model (MSSM)
Summary
Supersymmetry (SUSY) is one of the most fascinating models beyond the Standard Model (SM), which can simultaneously solve the naturalness problem, explain the cosmic dark matter and achieve the gauge coupling unification. ATLAS reported some excesses in the stop search with. No significant excess is reported by CMS in the same channel [4], they observe mild excesses in several signal regions. Even in the 0 lepton channel searches [5,6,7], ATLAS and CMS both show small excesses with a lower significance. If they are true signals it is likely due to new particles. We study the interpretation of the excesses as light stop pair production in the minimal supersymmetric standard model (MSSM).
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