Электронный каталог

Статья

Aad, G.
Measurement of the Polarisation of W Bosons Produced in Top-Quark Decays Using Dilepton Events at *%s = 13 TeV with the ATLAS Experiment / 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, A.Gongadze, M.I.Gostkin, N.Huseynov, S.N.Karpov, Z.M.Karpova, U.Kruchonak, V.Kukhtin, Y.Kulchitsky, E.Ladygin, V.Lyubushkin, T.Lyubushkina, S.Malyukov, M.Mineev, E.Plotnikova, I.N.Potrap, N.A.Rusakovich, M.Shiyakova, A.Soloshenko, T.Turtuvshin, S.Turchikhin, I.Yeletskikh, A.Zhemchugov, N.I.Zimine, [ATLAS Collab.] // Physics Letters B [Electronic resource]. – 2023. – Vol.843. – P.137829. – URL: https://doi.org/10.1016/j.physletb.2023.137829. – Bibliogr.:102.

A measurement of the polarisation of W bosons produced in top-quark decays is presented, using proton–proton collision data at a centre-of-mass energy of TeV. The data were collected by the ATLAS detector at the Large Hadron Collider and correspond to an integrated luminosity of 139 fb−1. The measurement is performed selecting events decaying into final states with two charged leptons (electrons or muons) and at least two b-tagged jets. The polarisation is extracted from the differential cross-section distribution of the ⁎ variable, where ⁎ is the angle between the momentum direction of the charged lepton from the W boson decay and the reversed momentum direction of the b-quark from the top-quark decay, both calculated in the W boson rest frame. Parton-level results, corrected for the detector acceptance and resolution, are presented for the ⁎ angle. The measured fractions of longitudinal, left- and right-handed polarisation states are found to be , and , in agreement with the Standard Model prediction.



ОИЯИ = ОИЯИ (JINR)2023
Спец.(статьи,препринты) = С 346.6е2 - Промежуточные бозоны
Спец.(статьи,препринты) = С 346.2в - Взаимодействие протонов с протонами