• Search for a vector-like quark T0 → tH via the diphoton decay mode of the Higgs boson in proton-proton collisions at √s = 13 TeV
Auteur:Tumasyan, A.; Clerbaux, Barbara; De Lentdecker, Gilles; Hohov, Dmytro; Jaramillo Gallego, Johny; Lee, Kyeongpil; Mahdavikhorrami, Mostafa; Makarenko, Inna; Malara, Andrea; Paredes Saenz, Santiago; Pétré, Laurent; Postiau, Nicolas; Thomas, Laurent; Vanden Bemden, Max; Vander Velde, Catherine; Vanlaer, Pascal; et al.
Informations sur la publication:The Journal of high energy physics, 2023, 57
Statut de publication:Publié, 2023-01-01
Sujet CREF:Physique des particules élémentaires
Note générale:A 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 = 13 TeV, corresponding to an integrated luminosity of 138 fb−1. 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%.