18-22 October 2021
Matsue, Shimane Prefecture, Japan
Asia/Tokyo timezone

The gT(x) contribution to single spin asymmetry in SIDIS

19 Oct 2021, 20:30
Room 601 (Kunibiki Messe)

Room 601

Kunibiki Messe

Parallel Session Presentation Transverse momentum structure (TMD) Joint TMD - GPD - HELCITY - Future session EU timezone


Sanjin Benic


I will talk about our recent computation [1] of a gT(x) contribution to transverse single spin asymmetry (SSA) in SIDIS in a collinear framework. In [1] we have found that gT(x) first appears at two-loops. I will explain main steps of our calculation and show the final formula for the cross section [2] in the Wilczek-Wandzura (WW) approximation, that is, neglecting the genuine twist-3 pieces. In the WW approximation gT(x) is given as an integral of the helicity distribution, which is known from global fits. In this way, an explicit evaluation of SSA has no free parameters in principle. I will show our results from an extensive numerical computation for the spin dependent moments A_UT, such as Sivers and Collins moment, coming from gT [2], for the future EIC kinematics. Finally, I will make comments about an analogue contribution in the gluon initiated channel arising from the G_3T(x) that is also included in our full numerical setup.

[1] S. B., Y. Hatta, H-n. Li, D.-J. Yang, Phys. Rev. D 100 (2019) 9, 094027
[2] S. B., Y. Hatta, A. Kaushik, H.-n. Li, in preparation

Primary authors

Sanjin Benic Yoshitaka Hatta (Brookhaven National Laboratory) Abhiram Kaushik (University of Zagreb) Hsiang-nan Li (Institute of Physics, Academia Sinica, Taipei)

Presentation Materials

There are no materials yet.