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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\u2013gluon plasma. <\/jats:p>","DOI":"10.1142\/s0217732312300224","type":"journal-article","created":{"date-parts":[[2012,7,24]],"date-time":"2012-07-24T09:34:23Z","timestamp":1343122463000},"page":"1230022","source":"Crossref","is-referenced-by-count":9,"title":["QUESTIONS AND PROSPECTS IN QUARKONIUM POLARIZATION MEASUREMENTS FROM PROTON\u2013PROTON TO NUCLEUS\u2013NUCLEUS COLLISIONS"],"prefix":"10.1142","volume":"27","author":[{"given":"PIETRO","family":"FACCIOLI","sequence":"first","affiliation":[{"name":"Laborat\u00f3rio de Instrumenta\u00e7\u00e3o e F\u00edsica Experimental de Part\u00edculas, 1000-149 Lisbon, Portugal"},{"name":"Centro de F\u00edsica Te\u00f3rica de Part\u00edculas, 1049-001 Lisbon, Portugal"},{"name":"Physics Department, Instituto Superior T\u00e9cnico, 1049-001 Lisbon, Portugal"}]}],"member":"219","published-online":{"date-parts":[[2012,7,24]]},"reference":[{"key":"rf1","doi-asserted-by":"publisher","DOI":"10.1140\/epjc\/s10052-010-1534-9"},{"key":"rf2","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.79.572"},{"key":"rf4","doi-asserted-by":"publisher","DOI":"10.1140\/epjc\/s10052-008-0826-9"},{"key":"rf5","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.55.R5269"},{"key":"rf6","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.56.4412"},{"key":"rf7","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.62.094005"},{"key":"rf8","first-page":"004","volume":"10","author":"Faccioli P.","journal-title":"JHEP"},{"key":"rf9","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.99.132001"},{"key":"rf10","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.102.151802"},{"key":"rf11","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.88.161802"},{"key":"rf12","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.108.151802"},{"key":"rf13","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.101.182004"},{"key":"rf14","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.86.2529"},{"key":"rf15","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.16.2219"},{"key":"rf16","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.85.2886"},{"key":"rf17","doi-asserted-by":"publisher","DOI":"10.1140\/epjc\/s10052-010-1420-5"},{"key":"rf18","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.83.056008"},{"key":"rf19","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.81.111502"},{"key":"rf20","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.105.061601"},{"key":"rf21","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.18.2447"},{"key":"rf22","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.79.014025"},{"key":"rf23","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.62.032002"},{"key":"rf24","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.30.1433"},{"key":"rf25","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.58.052004"},{"key":"rf26","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.83.096001"},{"key":"rf27","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.79.578"},{"key":"rf28","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.98.232001"},{"key":"rf29","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.84.2094"},{"key":"rf30","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.100.232001"},{"key":"rf31","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.101.152001"},{"key":"rf32","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.79.012001"},{"key":"rf34","doi-asserted-by":"publisher","DOI":"10.1016\/S0370-2693(99)00057-X"},{"key":"rf35","first-page":"335","volume":"39","author":"Alessandro B.","journal-title":"Eur. 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