Stop the top background of the stop search
By Yang Bai, Hsin-Chia Cheng, Jason Gallicchio, Jiayin Gu. 2012
160 citations recorded by the source corpus.
A bstractThe main background for the supersymmetric stop direct production search comes from Standard Model $ t\overline t $ events. For the single-lepton search channel, we introduce a few kinematic variables to further suppress this background by focusing on its dileptonic and semileptonic topologies. All are defined to have end points in the background, but not signal distributions. They can substantially improve the stop signal significance and mass reach when combined with traditional kinematic variables such as the total missing transverse energy. Among them, our variable $ M_{{T2}}^W $ hasthebestoverallperformancebecause it uses all available kinematic information, including the on-shell mass of both W’s. We see 20 %-30 % improvement on the discovery significance and estimate that the 8 TeV LHC run with 20 fb−1 of data would be able to reach an exclusion limit of 650-700 GeV for direct stop production, as long as the stop decays dominantly to the top quark and a light stable neutralino. Most of the mass range required for the supersymmetric solution of the naturalness problem in the standard scenario can be covered.
Subfields: Artificial Intelligence, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/c6db9d45720c0688f7b8d5d64ce1dcced9d5273f
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In Artificial Intelligence
In Nuclear and High Energy Physics
Citations in the corpus
- The hunt for the rest of the Higgs bosons (2015, methodology): “In stop searches, hard cuts on the transverse mass mT and the variable mWT2 [85] may be used to suppress semileptonic and dileptonic tt̄, respectively [75].”