Mar 23 – 27, 2020
Brooklyn, NY
US/Eastern timezone

A new contribution to transverse single spin asymmetry at two loops

Mar 25, 2020, 5:40 PM
20m
Brooklyn, NY

Brooklyn, NY

333 Adams Street, Brooklyn, New York 11201, USA
Contributed Talk Spin Physics Spin Physics

Speaker

Sanjin Benic (University of Zagreb)

Description

The main focus of this talk is our recent work [1] on transverse single spin asymmetry (SSA) in semi-inclusive DIS in a collinear twist-3 framework. I will explicitly demonstrate that a genuinely new contribution containing the $g_T$ distribution function (alongside the kinematical and the dynamical Qiu-Sterman functions) is first seen at two loops. The phase required for a non-zero SSA from $g_T$ is generated by a mechanism completely distinct from the familiar Qiu-Sterman and Collins contributions as it originates purely within the parton-level cross section. I will explain the structure of our all-order gauge invariant result for the hadronic tensor in SIDIS and show a complete set of gauge invariant diagrams that contribute at two loops. Finally, I will discuss collinear factorization in our final formula for the $g_T$ contribution as well as its phenomenological implications.

[1] S. B., Y. Hatta, H.-N. Li and D.-J. Yang, Phys.Rev. D100 (2019) no.9, 094027.

Primary author

Sanjin Benic (University of Zagreb)

Co-authors

Yoshitaka Hatta (Brookhaven National Laboratory) Hsiang-nan Li (Academia Sinica) Dong-Jing Yang (National Taiwan Normal University)

Presentation materials

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