Search for top quark decays t → qH, with H → γγ, in √s = 13 TeV pp collisions using the ATLAS detector Aaboud, M. Aguilar Saavedra, Juan Antonio Atlas Collaboration, / Flavour Changing Neutral Currents Hadron-Hadron scattering (experiments) Higgs physics 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. 2024-10-11T11:46:31Z 2024-10-11T11:46:31Z 2017-10-19 journal article The ATLAS collaboration., Aaboud, M., Aad, G. et al. Search for top quark decays t → qH, with H → γγ, in √s = 13 TeV pp collisions using the ATLAS detector. J. High Energ. Phys. 2017, 129 (2017). https://doi.org/10.1007/JHEP10(2017)129 https://hdl.handle.net/10481/95851 10.1007/JHEP10(2017)129 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Springer Nature