Электронный каталог

Статья

Hayrapetyan, A.
Measurement of the Polarizations of Prompt and Non-Prompt J/*q and *q(2S) Mesons Produced in pp Collisions at *%s = 13 TeV / A.Hayrapetyan, S.Afanasiev, D.Budkouski, I.Golutvin, I.Gorbunov, V.Karjavine, V.Korenkov, N.Krasnikov, A.Lanev, A.Malakhov, V.Matveev, V.Palichik, V.Perelygin, M.Savina, V.Shalaev, S.Shmatov, S.Shulha, V.Smirnov, O.Teryaev, N.Voytishin, B.S.Yuldashev, A.Zarubin, I.Zhizhin, A.Khvedelidze, Z.Tsamalaidze, [CMS Collab.] // Physics Letters B [Electronic resource]. – 2024. – Vol. 858. – P. 139044. – URL: https://doi.org/10.1016/j.physletb.2024.139044. – Bibliogr.: 64.

The polarizations of prompt and non-prompt J∕*q and ψ*q(2S) mesons are measured in proton-proton collisions at *5𝑠 = 13 TeV, using data samples collected by the CMS experiment in 2017 and 2018, corresponding to a total integrated luminosity of 103.3 fb&sup(−1). Based on the analysis of the dimuon decay angular distributions in the helicity frame, the polar anisotropy, *l&sub(*y), is measured as a function of the transverse momentum, 𝑝&sub(T), of the charmonium states, in the 25–120 and 20–100 GeV ranges for the J∕*q and *q(2S), respectively. The non-prompt polarizations agree with predictions based on the hypothesis that, for 𝑝&sub(T) *} 25 GeV, the non-prompt J∕*q and *q(2S) are predominantly produced in two-body B meson decays. The prompt results clearly exclude strong transverse polarizations, even for 𝑝&sub(T) exceeding 30 times the J∕*q mass, where *l&sub(*y) 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&sub(T), at low 𝑝&sub(T).



Спец.(статьи,препринты) = С 346.6а1 - Векторные мезоны
Спец.(статьи,препринты) = С 346.2в - Взаимодействие протонов с протонами
ОИЯИ = ОИЯИ (JINR)2024