Regular Article - Theoretical Physics
Studies of gluon TMDs and their evolution using quarkonium-pair production at the LHC
Van Swinderen Institute for Particle Physics and Gravity, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
2 IJCLab, CNRS/IN2P3, Université Paris-Saclay, 91405, Orsay, France
3 Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, via Bassi 6, 27100, Pavia, Italy
4 Dpto. de Física y Matemáticas, Universidad de Alcalá, Ctra. Madrid-Barcelona Km. 33, 28805, Alcalá de Henares, Madrid, Spain
5 Dipartimento di Fisica, Università di Cagliari, INFN, Sezione di Cagliari, Cittadella Universitaria, 09042, Monserrato, CA, Italy
6 Department of Physics, New Mexico State University, 88003, Las Cruces, NM, USA
Accepted: 6 January 2020
Published online: 4 February 2020
- or -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 pairs and in the future data sets of the high-luminosity LHC for pairs.
© The Author(s) 2020
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