Tumasyan, A.Adam, W.Andrejkovic, J.W.Bergauer, T.Chatterjee, S.Damanakis, K.Dragicevic, M.Gürpınar Güler, EmineGüler, Yalçın2023-12-092023-12-0920231029-8479https://doi.org/10.1007/JHEP09(2023)057https://hdl.handle.net/20.500.13091/4875A search for the electroweak production of a vector-like quark T′, decaying to a top quark and a Higgs boson is presented. The search is based on a sample of proton-proton collision events recorded at the LHC at s = 13 TeV, corresponding to an integrated luminosity of 138 fb1. This is the first T′ search that exploits the Higgs boson decay to a pair of photons. For narrow isospin singlet T′ states with masses up to 1.1 TeV, the excellent diphoton invariant mass resolution of 1–2% results in an increased sensitivity compared to previous searches based on the same production mechanism. The electroweak production of a T′ quark with mass up to 960 GeV is excluded at 95% confidence level, assuming a coupling strength κT = 0.25 and a relative decay width Γ/MT′ < 5%. [Figure not available: see fulltext.]. © 2023, The Author(s).eninfo:eu-repo/semantics/openAccessBeyond Standard ModelHadron-Hadron ScatteringTop PhysicsArticle10.1007/JHEP09(2023)0572-s2.0-85173980033