Measurement of the polarizations of prompt and non-prompt J/$\psi$ and $\psi$(2S) mesons produced in pp collisions at $\sqrt{s}$ = 13 TeV

Abstract

The polarizations of prompt and non-prompt J$/\psi$ and $\psi$(2S) mesons are measured in proton-proton collisions at $\sqrt{s}$ = 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, ${\lambda }_{\theta }$, is measured as a function of the transverse momentum, $p_{\mathrm{T}}$, of the charmonium states, in the 25-120 and 20-100 GeV ranges for the J$/\psi$ and $\psi$(2S), respectively. The non-prompt polarizations agree with predictions based on the hypothesis that, for $p_{\mathrm{T}}$ $\gtrsim$ 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 $p_{\mathrm{T}}$ 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 $\sqrt{s}$ = 7 TeV, the prompt polarizations show a significant variation with $p_{\mathrm{T}}$, at low $p_{\mathrm{T}}$.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-22-009 (CMS Public Pages)

References in corpus (42)

• An Introduction to PYTHIA 8.2
• Rigorous QCD Analysis of Inclusive Annihilation and Production of Heavy Quarkonium
• Heavy quarkonium: progress, puzzles, and opportunities
• The CMS trigger system
• Description and performance of track and primary-vertex reconstruction with the CMS tracker
• Performance of the CMS muon detector and muon reconstruction with proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Performance of the CMS Level-1 trigger in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• J/psi polarization at hadron colliders in nonrelativistic QCD
• Electron and photon reconstruction and identification with the CMS experiment at the CERN LHC
• J/psi polarization at Tevatron and LHC: Nonrelativistic-QCD factorization at the crossroads
• Polarization for Prompt J/psi, psi(2s) production at the Tevatron and LHC
• Measurement of J/Psi and Psi(2S) Polarization in ppbar Collisions at sqrt(s) = 1.8 TeV
• Prompt and non-prompt J/psi production in pp collisions at sqrt(s) = 7 TeV
• Towards the experimental clarification of quarkonium polarization
• Measurement of the prompt J/psi and psi(2S) polarizations in pp collisions at sqrt(s) = 7 TeV
• Measurement of $J/\psi$ polarization in $pp$ collisions at $\sqrt{s}=7$ TeV
• On the mechanisms of heavy-quarkonium hadroproduction
• J/$\psi$ polarization in pp collisions at $\sqrt{s}=7$ TeV
• J/psi and psi(2S) production in pp collisions at sqrt(s) = 7 TeV
• Measurement of the Y(1S), Y(2S), and Y(3S) polarizations in pp collisions at sqrt(s) = 7 TeV
• Quarkonium production in the LHC era: a polarized perspective
• Angular coefficients of Z bosons produced in pp collisions at sqrt(s) = 8 TeV and decaying to mu+mu- as a function of transverse momentum and rapidity
• Measurement of the angular coefficients in $Z$-boson events using electron and muon pairs from data taken at $\sqrt{s}=8$ TeV with the ATLAS detector
• Transverse momentum dependence of J/psi polarization at midrapidity in p+p collisions at sqrt(s)=200 GeV
• Fragmentation contributions to hadroproduction of prompt $J/\psi$, ${\chi }_{cJ}$, and $\psi (2S)$ states
• Measurement of J/psi and psi(2S) prompt double-differential cross sections in pp collisions at sqrt(s) = 7 TeV
• Study of Inclusive Production of Charmonium Mesons in B Decay
• QCD analysis of inclusive B decay into charmonium
• Measurement of $\psi (2S)$ polarisation in $pp$ collisions at $\sqrt{s}=7$ TeV
• Rotation-invariant relations in vector meson decays into fermion pairs
• Quarkonium momentum distributions in photoproduction and B decay
• A new approach to quarkonium polarization studies
• Polarizations of ${\chi }_{c1}$ and ${\chi }_{c2}$ in prompt production at the LHC
• Measurements of Angular Distributions of Muons From Upsilon Meson Decays in p p-bar Collisions at sqrt(s)=1.96 TeV
• NRQCD matrix elements in polarization of J-Psi produced from b-decay
• Optimal spin-quantization axes for the polarization of dileptons with large transverse momentum
• Production and polarization of direct $J/\psi$ to $\mathcal{O}({\alpha }_s^3)$ in the improved color evaporation model in collinear factorization
• From identical S- and P-wave pT/M spectra to maximally distinct polarizations: probing NRQCD with chi states
• Measurement of inclusive J/$\psi$ polarization in p+p collisions at $\sqrt{s}$ = 200 GeV by the STAR experiment
• Polarized J/psi production from B mesons at the Tevatron
• From prompt to direct J/$\psi$ production: new insights on the ${\chi }_{c1}$ and ${\chi }_{c2}$ polarizations and feed-down contributions from a global-fit analysis of mid-rapidity LHC data
• NRQCD colour-octet expansion vs LHC quarkonium production: signs of a hierarchy puzzle?

Cited by in corpus (3)

• How well does nonrelativistic QCD factorization work at next-to-leading order?
• Resummation of threshold double logarithms in hadroproduction of heavy quarkonium
• J/$\psi$ and ${\rm Y}$(1S) production in jets at LHC energies