Электронный каталог

Статья

Aad, G.
Search for Pair-Produced Vector-Like Top and Bottom Partners in Events with Large Missing Transverse Momentum in pp Collisions with the ATLAS Detector / G.Aad, F.Ahmadov, I.N.Aleksandrov, V.A.Bednyakov, I.R.Boyko, I.A.Budagov, G.A.Chelkov, A.Cheplakov, M.V.Chizhov, D.V.Dedovich, M.Demichev, N.Huseynov, A.Gongadze, M.I.Gostkin, S.N.Karpov, Z.M.Karpova, U.Kruchonak, Y.Kulchitsky, V.Kukhtin, E.Ladygin, V.Lyubushkin, T.Lyubushkina, S.Malyukov, M.Mineev, E.Plotnikova, I.N.Potrap, N.A.Rusakovich, M.Shiyakova, A.Soloshenko, S.Turchikhin, T.Turtuvshin, I.Yeletskikh, A.Zhemchugov, N.I.Zimine, [ATLAS Collab.] // The European Physical Journal C [Electronic resource]. – 2023. – Vol.83, No.8. – P.719. – URL: https://doi.org/10.1140/epjc/s10052-023-11790-7. – Bibliogr.:96.

A search for pair-produced vector-like quarks using events with exactly one lepton (e or ), at least four jets including at least one b-tagged jet, and large missing transverse momentum is presented. Data from proton–proton collisions at a centre-of-mass energy of 13 , recorded by the ATLAS detector at the LHC from 2015 to 2018 and corresponding to an integrated luminosity of 139 fb, are analysed. Vector-like partners T and B of the top and bottom quarks are considered, as is a vector-like X with charge , assuming their decay into a W, Z, or Higgs boson and a third-generation quark. No significant deviations from the Standard Model expectation are observed. Upper limits on the production cross-section of T and B quark pairs as a function of their mass are derived for various decay branching ratio scenarios. The strongest lower limits on the masses are 1.59 assuming mass-degenerate vector-like quarks and branching ratios corresponding to the weak-isospin doublet model, and 1.47 (1.46 ) for exclusive () decays. In addition, lower limits on the T and B quark masses are derived for all possible branching ratios.



ОИЯИ = ОИЯИ (JINR)2023
Спец.(статьи,препринты) = С 346.2в - Взаимодействие протонов с протонами
Спец.(статьи,препринты) = С 346.6д1 - Чармоний, боттомоний, топ-кварк. Очарованные частицы и др. резонансы из тяжелых кварков