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, λθ, is measured as a function of the transverse momentum, pT, 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 pT ≳ 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 pT exceeding 30 times the J/ψ mass, where λθ 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 pT, at low pT.

Hayrapetyan, A., Tumasyan, A., Adam, W., Andrejkovic, J.W., Bergauer, T., Chatterjee, S., et al. (2024). Measurement of the polarizations of prompt and non-prompt J/ψ and ψ(2S) mesons produced in pp collisions at √s=13TeV. PHYSICS LETTERS. SECTION B, 858, 1-30 [10.1016/j.physletb.2024.139044].

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

Battilana C.;Bonacorsi D.;Castro A.;Cuffiani M.;Diotalevi T.;Fanfani A.;Giommi L.;Guiducci L.;Lorusso M.;Paggi G.;Rossi Tisbeni S.;Rovelli T.;Siroli G. P.;
2024

Abstract

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, λθ, is measured as a function of the transverse momentum, pT, 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 pT ≳ 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 pT exceeding 30 times the J/ψ mass, where λθ 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 pT, at low pT.
2024
Hayrapetyan, A., Tumasyan, A., Adam, W., Andrejkovic, J.W., Bergauer, T., Chatterjee, S., et al. (2024). Measurement of the polarizations of prompt and non-prompt J/ψ and ψ(2S) mesons produced in pp collisions at √s=13TeV. PHYSICS LETTERS. SECTION B, 858, 1-30 [10.1016/j.physletb.2024.139044].
Hayrapetyan, A.; Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Bergauer, T.; Chatterjee, S.; Damanakis, K.; Dragicevic, M.; Hussain, P. S.; Jeitler, M.;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1003369
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