9-14 September 2018
University of Ferrara
Europe/Rome timezone
23RD INTERNATIONAL SPIN SYMPOSIUM

Difficulties in the description of Drell–Yan processes at low invariant mass and high transverse momentum

12 Sep 2018, 16:40
25m
A4 (Polo degli Adelardi - Via Adelardi, 33)

A4

Polo degli Adelardi - Via Adelardi, 33

Parallel Sessions 3D Structure of the Nucleon: TMDs 3D Structure of the Nucleon: TMDs

Speaker

Fulvio Piacenza (PV)

Description

In this talk, we discuss the transverse momentum distribution of Drell-Yan lepton pairs in fixed-target Drell-Yan experiments. We show that fixed-order theory underestimates data at large qT, by an amount that cannot be explained by perturbative truncation errors nor PDF uncertainties. We consider a modification of the standard collinear formalism that includes the effect of intrinsic transverse momentum also at large qT. This is intended to parametrize possible higher-twist effects which are presently not under theoretical control.

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