Measurement of the Polarizations of Prompt and Non-Prompt J/Ψ and Ψ(2s) Mesons Produced in Pp Collisions at √<i>s</I>=13 Tev

Hayrapetyan, A.Tumasyan, A.Adam, W.Andrejkovic, J. W.Bergauer, T.Chatterjee, S.Zhokin, A.2025-02-172025-02-1720240370-26931873-244510.1016/j.physletb.2024.139044https://doi.org/10.1016/j.physletb.2024.139044https://hdl.handle.net/20.500.14517/7646Pesaresi, Mark/0000-0002-9759-1083; Schieck, Jochen/0000-0002-1058-8093; Giommi, Luca/0000-0003-3539-4313; Navarrete Ramos, Efren/0000-0002-5180-4020; Della Ricca, Giuseppe/0000-0003-2831-6982; Hall, Geoffrey/0000-0002-6299-8385; Rossi Tisbeni, Simone/0000-0001-6776-285X; Colaleo, Anna/0000-0002-0711-6319; Shopova, Mariana/0000-0001-6664-2493; Milosevic, Vukasin/0000-0002-1173-0696; Hernandez Calama, Jose Maria/0000-0001-6436-7547; da Cruz e Silva, Cristovao/0000-0002-1231-3819; Radogna, Raffaella/0000-0002-1094-5038; Tapper, Alexander/0000-0003-4543-864X; Grunewald, Martin/0000-0002-5754-0388; Tedeschi, Tommaso/0000-0002-7125-2905; Martinez Rivero, Celso/0000-0002-3224-956X; Perez Adan, Danyer/0000-0003-3416-0726; Bruschini, Davide/0000-0001-7248-2967; Ligabue, Franco/0000-0002-1549-7107The polarizations of prompt and non-prompt J/psi and psi(2S) mesons are measured in proton-proton collisions at root s = 13TeV, 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, lambda(theta), is measured as a function of the transverse momentum, p(T), of the charmonium states, in the 25-120 and 20-100GeV ranges for the J/psi and psi(2S), respectively. The non-prompt polarizations agree with predictions based on the hypothesis that, for p(T) greater than or similar to 25 GeV, the non-prompt J/psi and psi(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/psi mass, where lambda(theta) tends to an asymptotic value around 0.3. Taken together with previous measurements, by CMS and LHCb at root s = 7TeV, the prompt polarizations show a significant variation with p(T), at low p(T).eninfo:eu-repo/semantics/openAccessCmsQuarkonium ProductionQuarkonium PolarizationMeasurement of the Polarizations of Prompt and Non-Prompt J/Ψ and Ψ(2s) Mesons Produced in Pp Collisions at √<i>s</I>=13 TevArticleQ1Q1858WOS:0013813335000010