TY - JOUR
T1 - Measurement of the polarizations of prompt and non-prompt J/Ψ and Ψ(2S) mesons produced in pp collisions at √s = 13TeV
AU - The CMS collaboration
AU - Hayrapetyan, A.
AU - Tumasyan, A.
AU - Adam, W.
AU - Andrejkovic, J. W.
AU - Bergauer, T.
AU - Chatterjee, S.
AU - Damanakis, K.
AU - Dragicevic, M.
AU - Hussain, P. S.
AU - Jeitler, M.
AU - Krammer, N.
AU - Li, A.
AU - Liko, D.
AU - Mikulec, I.
AU - Schieck, J.
AU - Schöfbeck, R.
AU - Schwarz, D.
AU - Sonawane, M.
AU - Templ, S.
AU - Waltenberger, W.
AU - Wulz, C. E.
AU - Darwish, M. R.
AU - Janssen, T.
AU - Van Laer, T.
AU - Van Mechelen, P.
AU - Breugelmans, N.
AU - D’Hondt, J.
AU - Dansana, S.
AU - De Moor, A.
AU - Delcourt, M.
AU - Heyen, F.
AU - Lowette, S.
AU - Makarenko, I.
AU - Müller, D.
AU - Tavernier, S.
AU - Tytgat, M.
AU - Van Onsem, G. P.
AU - Van Putte, S.
AU - Vannerom, D.
AU - Bilin, B.
AU - Clerbaux, B.
AU - Cappati, A.
AU - Davignon, O.
AU - De Wit, A.
AU - Granier de Cassagnac, R.
AU - Nguyen, M.
AU - Ochando, C.
AU - Salerno, R.
AU - Zabi, A.
AU - Zghiche, A.
N1 - Publisher Copyright:
© 2024 CERN for the benefit of the CMS Collaboration
PY - 2024/11/1
Y1 - 2024/11/1
N2 - The polarizations of prompt and non-prompt [Formula presented] 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 103.3fb−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 [Formula presented] and ψ(2S), respectively. The non-prompt polarizations agree with predictions based on the hypothesis that, for pT≳25GeV, the non-prompt [Formula presented] 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 [Formula presented] 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.
AB - The polarizations of prompt and non-prompt [Formula presented] 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 103.3fb−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 [Formula presented] and ψ(2S), respectively. The non-prompt polarizations agree with predictions based on the hypothesis that, for pT≳25GeV, the non-prompt [Formula presented] 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 [Formula presented] 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.
KW - CMS
KW - Quarkonium polarization
KW - Quarkonium production
UR - https://www.scopus.com/pages/publications/85205550955
U2 - 10.1016/j.physletb.2024.139044
DO - 10.1016/j.physletb.2024.139044
M3 - Article
AN - SCOPUS:85205550955
SN - 0370-2693
VL - 858
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
M1 - 139044
ER -