Scientific article
Open access

Search for top quark decays t → qH , with H → γγ, in √s = 13 TeV pp collisions using the ATLAS detector

ContributorsATLAS Collaboration
Published inJournal of High Energy Physics, vol. 1710, p. 129-172
  • Open Access - SCOAP3
Publication date2017

This article presents a search for flavour-changing neutral currents in the decay of a top quark into an up-type ( q = c, u ) quark and a Higgs boson, where the Higgs boson decays into two photons. The proton-proton collision data set analysed amounts to 36.1 fb −1 at √s = 13 TeV collected by the ATLAS experiment at the LHC. Top quark pair events are searched for, where one top quark decays into qH and the other decays into bW . Both the hadronic and leptonic decay modes of the W boson are used. No significant excess is observed and an upper limit is set on the t → cH branching ratio of 2 . 2 × 10 −3 at the 95% confidence level, while the expected limit in the absence of signal is 1 . 6 × 10 −3 . The corresponding limit on the tcH coupling is 0.090 at the 95% confidence level. The observed upper limit on the t → uH branching ratio is 2 . 4 × 10 −3 .

  • Flavour Changing Neutral Currents
  • Hadron-Hadron scattering (experiments)
  • Higgs physics
  • Top physics
Citation (ISO format)
ATLAS Collaboration. Search for top quark decays t → qH , with H → γγ, in √s = 13 TeV pp collisions using the ATLAS detector. In: Journal of High Energy Physics, 2017, vol. 1710, p. 129–172. doi: 10.1007/JHEP10(2017)129
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Article (Published version)
ISSN of the journal1029-8479

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