Junjie Cao, Chengcheng Han, Lei Wu, Jin Min Yang, Yang Zhang
We consider natural supersymmetry in the framework of the minimal supersymmetric standard model (called natural MSSM) and examine the observability of stop pair production at the LHC. We first scan the parameter space under current experimental constraints, including the direct limits from SUSY particle searches and the indirect limits from precision electroweak data and B-decays. Then in the allowed parameter space we study the stop pair production at the LHC followed by the stop decaying to a top plus a neutralino (assumed to be the lightest sparticle). From a Monte Carlo simulation for the signal and backgrounds, we find that the stop pair production followed by such a decay chain is unaccessible at the LHC (8 TeV) for a luminosity below 100 fb^{-1}. However, at the LHC (14 TeV) with a luminosity above 50 fb^{-1}, the stop pair production is found to be detectable in a sizable part of the parameter space (albeit the whole parameter space so far survived cannot be totally covered even with a luminosity of 100 fb^{-1}).
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http://arxiv.org/abs/1206.3865
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