[NT/RBRC seminar] Quarkonium production at the EIC as a probe of gluon TMDs

by Dr Pieter Taels (University of Antwerp)

Friday 19 Nov 2021, 09:00 → 11:00 US/Eastern

https://bnl.zoomgov.com/j/1619586603?pwd=OGU3OWV3akdnRys1a3JmRW5rNmdudz09

Transverse momentum dependent parton distribution functions (TMDs) are extensions of the wellknown
collinear PDFs. They contain, apart from the usual x- and scale dependence, also
information on the transverse momentum carried by the parton, and on the spin correlations.
Experimentally, not so much is known about gluon TMDs, since they are subleading with respect
to their quark counterparts in the few processes for which TMD factorization is proven (Drell-Yan,
SIDIS). This problem is bypassed by studying quarkonium, to which the gluon distributions in the
proton couple already at leading order.
I will review two recent studies [1,2] where inclusive and associated quarkonium electroproduction
is put forward as a probe of the proton gluon TMDs. I will then elaborate on subtleties [3] that
arise, related to the transverse-momentum dependence of the so-called long distance matrix
elements (LDMEs), which encode the nonperturbative information on the hadronization of the
heavy-quark pair. 

 

[1] A. Bacchetta, D. Boer, C. Pisano, and P. Taels, Gluon TMDs and NRQCD matrix elements in
production at an EIC, Eur. Phys. J. C 80 (2020) 72
[2] U. D’Alesio, F. Murgia, C. Pisano, and P. Taels, Azimuthal asymmetries in semi-inclusive J/psi+jet
production at an EIC, Phys. Rev. D 100 (2019) 094016
[3] D. Boer, U. D’Alesio, F. Murgia, C. Pisano, and P. Taels, J/psi meson production in SIDIS:
matching high and low transverse momentum, JHEP 09 (2020) 40