Probing compressed top squark scenarios at the LHC at 14 TeV
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2014 American Physical Society. A feasibility study is presented for the search of the lightest top squark (t) in a compressed scenario, where its mass is approximately equal to the sum of the masses of the top quark and the lightest neutralino 10 and there exists no limit from the current 8 TeV data or from the 14 TeV projections. The study is performed in the final state of two b jets, one lepton, large missing transverse energy, and two energetic jets with a large separation in pseudorapidity, in opposite hemispheres, and with large dijet mass. The analysis shows that the LHC could probe compressed top-squark masses 300GeV with an integrated luminosity of 300fb-1 for two- (t+10) and three-body (b+W+10) final states arising from the top-squark decay at 5 significance with no systematic uncertainty. After including the systematics, the significance for mt=200GeV and M=7GeV is expected to be 6(3) for 300fb-1 luminosity with 3(5)% systematic uncertainty, while the significance becomes 4(2) for the same top-squark mass with M=-7GeV.