Search for Top Quark Decays via Higgs-Boson-Mediated Flavor-Changing Neutral Currents in Pp Collisions at √s = 8 TeV
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Sirunyan2017_Article_SearchForThird-generationScala.pdf
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Author(s)
CMS Collaboration
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Apyan, Aram
Azzolini, Virginia
Barbieri, Richard Alexander
Baty, Austin Alan
Bi, Ran
Bierwagen, Katharina
Brandt, Stephanie Akemi
Date Issued
July 2017
Journal
Journal of High Energy Physics
Publisher
Springer Nature
Citation
Khachatryan, V. et al. “Search for Top Quark Decays via Higgs-Boson-Mediated Flavor-Changing Neutral Currents in Pp Collisions at √s = 8 TeV.” Journal of High Energy Physics 2017, 2 (February 2017): 79 © 2017 The Author(s)
Version
Final published version
Abstract
A search is performed for Higgs-boson-mediated flavor-changing neutral currents in the decays of top quarks. The search is based on proton-proton collision data corresponding to an integrated luminosity of 19.7 fb⁻¹ at a center-of-mass energy of 8 TeV collected with the CMS detector at the LHC. Events in which a top quark pair is produced with one top quark decaying into a charm or up quark and a Higgs boson (H), and the other top quark decaying into a bottom quark and a W boson are selected. The Higgs boson in these events is assumed to subsequently decay into either dibosons or difermions. No significant excess is observed above the expected standard model background, and an upper limit at the 95% confidence level is set on the branching fraction ℬ(t → Hc) of 0.40% and ℬ(t → Hu) of 0.55%, where the expected upper limits are 0.43% and 0.40%, respectively. These results correspond to upper limits on the square of the flavor-changing Higgs boson Yukawa couplings |λtc[superscript H]|²< 6.9 × 10⁻³ and |λtuH|²< 9.8 × 10⁻³. Keywords: Flavour Changing Neutral Currents; Hadron-Hadron scattering (experiments); Top physics; Higgs physics
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1007/JHEP02(2017)079
