Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at √s = 8 TeV
Name
Khachatryan-2014-Search for top-squar.pdf
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Author(s)
Apyan, Aram
Barbieri, Richard Alexander
Busza, Wit
Cali, Ivan Amos
Chan, M.
Di Matteo, Leonardo
Dutta, Valentina
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Gulhan, Doga Can
Date Issued
September 2014
Journal
Physics Letters B
Publisher
Elsevier B.V.
Citation
“Search for Top-Squark Pairs Decaying into Higgs or Z Bosons in Pp Collisions at √s = 8 TeV.” Physics Letters B 736 (September 2014): 371–397.
Version
Final published version
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 √s=8 TeV collected in 2012 with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 19.5 fb[superscript −1]. 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 t˜2 decaying to a lighter top-squark mass eigenstate t˜1 via either ˜2→Ht˜1 or t˜2→Zt˜1, followed in both cases by t˜1→tχ˜10, where χ˜10 is an undetected, stable, lightest supersymmetric particle. The interpretation is performed in the region where the mass difference between thet˜1 and χ˜10 states is approximately equal to the top-quark mass (m[subscript t˜1]−mχ˜10≃mt), which is not probed by searches for direct t˜1 squark pair production. The analysis excludes top squarks with masses m[subscript t˜2]<575 GeV and m[subscript t˜1]<400 GeV at a 95% confidence level.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2014.07.053
