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

In: Journal of High Energy Physics, Vol. 2017, 129, 10.2017, p. 1-43.

Research output: Contribution to journalArticle



  • The ATLAS Collaboration


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.
Original languageEnglish
Article number129
Pages (from-to)1-43
Number of pages43
JournalJournal of High Energy Physics
Early online date19 Oct 2017
Publication statusPublished - Oct 2017
This open access research output is licenced under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.

ID: 28960442