XXVIII International Workshop on Deep-Inelastic Scattering and Related Subjects

Quark Sivers Function at Small-x: Return of a Spin-Dependent Odderon

13 Apr 2021, 12:18

18m

Virtual (Stony Brook, NY)

Contributed Talk Small-x, Diffraction and Vector Mesons Small-x, Diffraction and Vector Mesons

Speaker

M Gabriel Santiago (Ohio State University)

Description

We apply the formalism developed earlier $[1,2]$ for studying the small-$x$ asymptotics of transverse momentum dependent parton distribution functions (TMDs) to construct the small-$x$ asymptotics of the quark Sivers function. We explicitly construct the transversely polarized, fundamental "Wilson line" operator to sub-sub-eikonal order. We then express the Sivers function in terms of dipole scattering amplitudes containing the transversely polarized "Wilson line", and show that the main term which contributes to the Sivers function is the spin-dependent odderon, similar to the case of the gluon Sivers function derived by Boer, Eschevarria, Mulders and Zhou [3] (see also [4]).
[1] Y. V. Kovchegov and M. D. Sievert, Phys. Rev. D99, 054032 (2019).
[2] Y. V. Kovchegov and M. D. Sievert, Phys. Rev. D99, 054033 (2019).
[3] D. Boer, M. G. Echevarria, P. Mulders, and J. Zhou, Phys. Rev. Lett. 116, 122001 (2016).
[4] L. Szymanowski and J. Zhou, Phys. Lett. B760, 249 (2016).

Presentation materials

santiago_DIS_2021.pptx

Youtube Link