Quarkonium production at the LHC: a phenomenological analysis of surprisingly simple data patterns

Abstract

The LHC quarkonium production measurements reveal a startling observation: the J/$\psi$, $\psi$(2S), ${\chi }_{c1,2}$ and ${\rm Y}$(nS) $p_{\mathrm{T}}$-differential cross sections are compatible with one universal momentum scaling pattern. Considering also the absence of strong polarizations of directly and indirectly produced S-wave mesons, we are led to the conclusion that there is currently no evidence of a dependence of the partonic production mechanisms on the quantum numbers and mass of the final state. The experimental observations supporting this universal production scenario are remarkably significant, as shown by a new analysis approach, unbiased by specific theoretical calculations of partonic cross sections, which are only considered a posteriori, in comparisons with the data-driven results.

Submitted to Phys. Lett. B

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• Dissociation of Quarkonium in hot and Dense Media in an Anisotropic Plasma in the Non-Relativistic Quark Model
• Inclusive Production of Heavy Quarkonia in pNRQCD
• Prompt and non-prompt J/$\psi$ production cross sections at midrapidity in proton-proton collisions at $\sqrt{s}$ = 5.02 and 13 TeV
• From identical S- and P-wave pT/M spectra to maximally distinct polarizations: probing NRQCD with chi states
• Measurement of B${}_{\mathrm{c}}$(2S)${}^{+}$ and B${}_{\mathrm{c}}^{\ast }$(2S)${}^{+}$ cross section ratios in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Constraints on the ${\chi }_{c1}$ versus ${\chi }_{c2}$ polarizations in proton-proton collisions at $\sqrt{s}=$ 8 TeV
• The fate of quarkonia in heavy-ion collisions at LHC energies: a unified description of the sequential suppression patterns
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• NRQCD colour-octet expansion vs LHC quarkonium production: signs of a hierarchy puzzle?
• Study of charmonium production using decays to hadronic final states with the LHCb experiment