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

## Single-spin asymmetry at subleading level

Jun 6, 2019, 2:30 PM
30m
Rangos 3

### Rangos 3

Contributed Nucleon Structure

### Description

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 No