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Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at sqrt(s) = 8 TeV

Abstract : A search for supersymmetry through the direct pair production of top squarks, with Higgs (H) or Z bosons in the decay chain, is performed using a data sample of proton-proton collisions at sqrt(s) = 8 TeV collected in 2012 with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 19.5 inverse femtobarns. The search is performed using a selection of events containing leptons and bottom-quark jets. No evidence for a significant excess of events over the standard model background prediction is observed. The results are interpreted in the context of simplified supersymmetric models with pair production of a heavier top-squark mass eigenstate stop[2] decaying to a lighter top-squark mass eigenstate stop[1] via either stop[2] to H stop[1] or stop[2] to Z stop[1], followed in both cases by stop[1] to t neutralino, where neutralino is an undetected, stable, lightest supersymmetric particle. The interpretation is performed in the region where the mass difference between the stop[1] and neutralino states is approximately equal to the top-quark mass (m[stop[1]] - m[neutralino] ~= m[t]), which is not probed by searches for direct stop[1] squark pair production. The analysis excludes top squarks with masses m[stop[2]]<575 GeV and m[stop[1]]<400 GeV at a 95% confidence level.
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http://hal.in2p3.fr/in2p3-00991791
Contributor : Sylvie Flores <>
Submitted on : Friday, May 16, 2014 - 7:23:45 AM
Last modification on : Wednesday, November 25, 2020 - 4:10:43 PM

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V. Khachatryan, S. Baffioni, F. Beaudette, P. Busson, C. Charlot, et al.. Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at sqrt(s) = 8 TeV. Physics Letters B, Elsevier, 2014, 736, pp.371-397. ⟨10.1016/j.physletb.2014.07.053⟩. ⟨in2p3-00991791⟩

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