Journal
NUCLEAR PHYSICS B
Volume 920, Issue -, Pages 192-210Publisher
ELSEVIER
DOI: 10.1016/j.nuclphysb.2017.04.011
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Funding
- European Research Council (ERC) under European Union [647981, 3DSPIN]
- CNRS-IN2P3 (TMD@NLO)
- Bundesministerium fur Bildung and Forschung (BMBF) [05P15VTCA1]
- European Research Council (ERC) [647981] Funding Source: European Research Council (ERC)
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We discuss the impact on the study of gluon transverse momentum dependent distributions (TMDs) of the associated production of a lepton pair and a Upsilon (or a J/psi) in unpolarised proton-proton collisions, pp -> Ql (l) over barX, at LHC energies, where one can assume that such final states are dominantly induced by gluon fusion. If the transverse momentum of the quarkonium-dilepton system - namely, the transverse momentum imbalance of the quarkonium state and the lepton pair is small, the corresponding cross sections can be calculated within the framework of TMD factorisation. Using the helicity formalism, we show in detail how these cross sections are connected to the moments of two independent TMDs: the distribution of unpolarised gluons, f(1)(g), and the distribution of linearly polarised gluons, h(1)(perpendicular to g). We complete our exhaustive derivation of these general relations with a phenomenological analysis of the feasibility of the TMD extraction, as well as some outlooks. (C) 2017 The Author(s). Published by Elsevier B.V.
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