Recently, there have been significant progresses for theories of quarkonium production in proton-proton and proton-nucleus collisions at colliders. We give a brief review of these theories, with emphasis on the successes and difficulties of nonrelativistic QCD factorization formalism, as well as the new proposal of soft gluon factorization.
DOI: https://doi.org/10.22323/1.387.0020
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