Resummation, Evolution and Factorization REF 2026

Session

Talks III

20 Oct 2026, 11:50

Santiago de Compostela, Spain

24. Azimuthal modulations in double quarkonium production in polarized hadronic collisions

Franco E. Barattini (Università di Cagliari & INFN Cagliari)

20/10/2026, 11:50

In the context of polarized hadron-hadron collisions, quarkonium-pair production provides an interesting process to study the transverse momentum and spin structure of gluons through TMD observables. In this work, we study the gluon-gluon channel within TMD factorization, and derive the corresponding azimuthal modulations in terms of gluon TMDs. We focus on those relevant for spin-dependent...

35. qT/Q correction for unpolarized Drell-Yan in TMD factorization

Arturo Arroyo Castro (Universidad Complutense de Madrid)

20/10/2026, 12:10

The transverse momentum dependent (TMD) factorization theorem accommodates various types of power corrections. Among them, the least studied are $q_T/Q$ corrections, which become significant at large values of transverse momentum. These corrections partially originate from higher-twist TMD distributions, which exhibit singularity at small transverse distances. We propose a decomposition that...

36. Event-axis TMD measurements in $e^{+}e^{−}$ and SIDIS

Daniel Díaz Fernández (Universidad Complutense de Madrid)

20/10/2026, 12:30

Transverse-momentum-dependent (TMD) fragmentation in $e^{+}e^{−}$ collisions can be studied by measuring hadrons with respect to the thrust axis, and has been measured at Belle. This provides a complementary way to extract TMD fragmentation functions, avoiding the need to disentangle the two TMD fragmentation functions that enter conventional back-to-back hadron-pair measurements. Starting...

39. CSS evolution in light-cone gauge: studying the impacts of residual gauge and of gauge link type

Guillaume Beuf

20/10/2026, 12:50

This talk presents two studies related to the one-loop CSS evolution of TMD distributions within the background field method, in the target light-cone gauge (making the partonic picture for the hadron target manifest).

The first study concerns the potential effect of the residual gauge freedom in the light-cone gauge and of the prescriptions proposed to address it. We consider on the one...

29. One-loop renormalization of the quark TMD in the projectile light-cone gauge

Mirja Tevio

20/10/2026, 13:10

We use the background field formalism to calculate NLO corrections to a quark transverse momentum dependent parton distribution function (TMD) in the projectile light-cone gauge, i.e. $A^+=0$ for a left-moving target.
We calculate the full result using the Mandelstam–Leibbrandt prescription to handle the light-cone singularity.
From the one-loop renormalization of the quark TMD, we obtain...