Jun 2 – 7, 2019
Carnegie Mellon University
America/New_York timezone

Single-spin asymmetry at subleading level

Jun 6, 2019, 2:30 PM
Rangos 3

Rangos 3

Contributed Nucleon Structure Nucleon Structure


Hsiang-nan Li (Academia Sinica)


We find that a parton-level hard cross section also generates a phase at two loops in semi-inclusive deeply inelastic scattering (SIDIS) off a polarized nucleon, which represents a new source of transverse single-spin asymmetry different from those in the Sivers function and the Collins function. As an extension of the above analysis, we complete the sources of transverse single spin asymmetry at two parton twist three accuracy in SIDIS up to two loops.
One source from the parton distribution function $g_T$ survives in the collinear factorization, whose associated hard scattering kernel starts from two loops. The potential impact on the current understanding of the underlying mechanism for single-spin asymmetry is explained.

Early Consideration Yes
Graduate Student No

Primary author

Hsiang-nan Li (Academia Sinica)


Dr Sanjin Beni (Kyoto University) Prof. Yoshitaka Hatta (BNL) Mr Dong-Jing Yang (National Taiwan Normal University)

Presentation materials