Measurement of the polarizations of prompt and non-prompt J/ψ and ψ(2S) mesons produced in pp collisions at √s = 13 TeV

Boos, E.; Bunichev, V.; Dubinin, M.; Dudko, L.; Ershov, A.A.; Gribushin, A.; Klyukhin, V.; Kodolova, O.; Obraztsov, S.; Petrushanko, S.V.; Savrin, V.; Snigirev, A.; CMS, C.

Авторы: Boos E., Bunichev V., Dubinin M., Dudko L., Ershov A.A., Gribushin A., Klyukhin V., Kodolova O., Obraztsov S., Petrushanko S.V., Savrin V., Snigirev A., CMS Collaboration
Журнал: Physics Letters B
Том: 858
Год издания: 2024
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 139044
DOI: 10.1016/j.physletb.2024.139044
Аннотация: The polarizations of prompt and non-prompt J∕ψ and ψ(2S) mesons are measured in proton-proton collisions at √𝑠 = 13 TeV, using data samples collected by the CMS experiment in 2017 and 2018, corresponding to a total integrated luminosity of 103.3 fb−1. Based on the analysis of the dimuon decay angular distributions in the helicity frame, the polar anisotropy, 𝜆_𝜗, is measured as a function of the transverse momentum, 𝑝_T, of the charmonium states, in the 25–120 and 20–100 GeV ranges for the J∕ψ and ψ(2S), respectively. The non-prompt polarizations agree with predictions based on the hypothesis that, for 𝑝_T ≳ 25 GeV, the non-prompt J∕ψ and ψ(2S) are predominantly produced in two-body B meson decays. The prompt results clearly exclude strong transverse polarizations, even for 𝑝_T exceeding 30 times the J∕ψ mass, where 𝜆_𝜗 tends to an asymptotic value around 0.3. Taken together with previous measurements, by CMS and LHCb at √𝑠 = 7 TeV, the prompt polarizations show a significant variation with 𝑝_T, at low 𝑝_T.
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Measurement of the polarizations of prompt and non-prompt J/ψ and ψ(2S) mesons produced in pp collisions at √s = 13 TeVстатья Исследовательская статья

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