Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 80, Issue 2, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-020-7619-1
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Funding
- TMD Topical Collaboration
- CNRS-IN2P3 project TMD@NLO
- European Union [824093]
- Marie Sklodowska-Curie Grant GlueCore [793896]
- Marie Curie Actions (MSCA) [793896] Funding Source: Marie Curie Actions (MSCA)
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J/psi - or gamma-pair production at the LHC are promising processes to study the gluon transverse momentum distributions (TMDs) which remain very poorly known. In this article, we improve on previous results by including the TMD evolution in the computation of the observables such as the pair-transverse-momentum spectrum and asymmetries arising from the linear polarization of gluons inside unpolarized protons. We show that the azimuthal asymmetries generated by the gluon polarization are reduced compared to the tree level case but are still of measurable size (in the 5-10% range). Such asymmetries should be measurable in the available data sets of J/psi pairs and in the future data sets of the high-luminosity LHC for gamma pairs.
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