Single-spin asymmetries at two loops

Benić, Sanjin; Hatta, Yoshitaka; Li, Hsiang-nan; Yang, Dong -Jing

doi:10.1103/PhysRevD.100.094027

Title: Single-spin asymmetries at two loops

Journal Article · 22 November 2019 · Physical Review D

DOI: https://doi.org/10.1103/PhysRevD.100.094027 · OSTI ID:1575303

Benić, Sanjin ^[1];

^[2];

^[3];

^[4]

Kyoto Univ., Kyoto (Japan). Yukawa Inst. for Theoretical Physics; Univ. of Zagreb, Zagreb (Croatia). Dept. of Physics, Faculty of Science
Brookhaven National Lab. (BNL), Upton, NY (United States). Physics Dept.
Academia Sinica, Taiwan (Republic of China). Inst. of Physics
National Taiwan Normal Univ., Taiwain (Republic of China). Dept. of Physics

We find a novel mechanism for generating transverse single-spin asymmetry (SSA) in semi-inclusive deep inelastic scattering, distinct from the known ones which involve the Sivers and Collins functions, or their collinear twist-three counterparts. It is demonstrated that a phase needed for SSA can be produced purely within a parton-level cross section starting at two loops. We identify the complete set of two-loop diagrams for SSA, and discuss their gauge invariance and collinear factorization which features the gT distribution function. In the kT factorization framework, many more sources for SSA exist, and contributions from all possible two-parton transverse-momentum-dependent parton distribution functions are presented up to two loops and twist three.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0012704

OSTI ID:: 1575303

Alternate ID(s):: OSTI ID: 1575916

Report Number(s):: BNL-212365-2019-JAAM; PRVDAQ; TRN: US2100129

Journal Information:: Physical Review D, Vol. 100, Issue 9; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 9 works

Citation information provided by
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