Questions and prospects in quarkonium polarization measurements from proton-proton to nucleus-nucleus collisions

Abstract

Polarization measurements are the best instrument to understand how quark and antiquark combine into the different quarkonium states, but no model has so far succeeded in explaining the measured J/psi and Upsilon polarizations. On the other hand, the experimental data in proton-antiproton and proton-nucleus collisions are inconsistent, incomplete and ambiguous. New analyses will have to properly address often underestimated issues: the existence of azimuthal anisotropies, the dependence on the reference frame, the influence of the experimental acceptance on the comparison with other measurements and with theory. Additionally, a recently developed frame-invariant formalism will provide an alternative and often more immediate physical viewpoint and, at the same time, will help probing systematic effects due to experimental biases. The role of feed-down decays from heavier states, a crucial missing piece in the current experimental knowledge, will have to be investigated. Ultimately, quarkonium polarization measurements will also offer new possibilities in the study of the properties of the quark-gluon plasma.

Invited brief review, reflecting seminars and presentations made at CERN, Fermilab, Brookhaven, DESY, HEPHY, etc. Published in Modern Physics Letters A. 23 pages, 11 figures

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Cited by in corpus (7)

• Measurement of $J/\psi$ polarization in $pp$ collisions at $\sqrt{s}=7$ TeV
• New Observables in Inclusive Production of Quarkonia
• Next-to-leading-order QCD corrections to the yields and polarisations of J/Psi and Upsilon directly produced in association with a Z boson at the LHC
• Recent Results in Bottomonium
• Spin physics and TMD studies at A Fixed-Target ExpeRiment at the LHC (AFTER@LHC)
• Constraints on the ${\chi }_{c1}$ versus ${\chi }_{c2}$ polarizations in proton-proton collisions at $\sqrt{s}=$ 8 TeV
• Physics with charmonia at the SPD experiment