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


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Aaboud M., Aad G., Abbott B., Abdinov O., Abeloos B., Abidi S., ...More

Journal of High Energy Physics, vol.2017, no.10, 2017 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 2017 Issue: 10
  • Publication Date: 2017
  • Doi Number: 10.1007/jhep10(2017)129
  • Journal Name: Journal of High Energy Physics
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: Flavour Changing Neutral Currents, Hadron-Hadron scattering (experiments), Higgs physics, Top physics
  • Ankara University Affiliated: Yes

Abstract

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.[Figure not available: see fulltext.].