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 root s = 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 kappa(T) = 0.25 and a relative decay width Gamma/M-T '< 5%.
Search for a vector-like quark T′ → tH via the diphoton decay mode of the Higgs boson in proton-proton collisions at sqrt{s} = 13 TeV
Cappati, A.;Meridiani, P.;Amapane, N.;Argiro, S.;Bellan, R.;Bellora, A.;Costa, M.;Covarelli, R.;Grippo, M.;Kiani, B.;Migliore, E.;Monteil, E.;Obertino, M. M.;Pacher, L.;Shchelina, K.;Siviero, F.;Sola, V.;Solano, A.;Soldi, D.;Tornago, M.;Vagnerini, A.;Rumerio, P.;Ravera, F.;Salvatico, R.;
2023-01-01
Abstract
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 root s = 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 kappa(T) = 0.25 and a relative decay width Gamma/M-T '< 5%.File | Dimensione | Formato | |
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JHEP09(2023)057.pdf
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