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Title: Single-spin asymmetries at two loops

Abstract

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.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Kyoto Univ., Kyoto (Japan). Yukawa Inst. for Theoretical Physics; Univ. of Zagreb, Zagreb (Croatia). Dept. of Physics, Faculty of Science
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Physics Dept.
  3. Academia Sinica, Taiwan (Republic of China). Inst. of Physics
  4. National Taiwan Normal Univ., Taiwain (Republic of China). Dept. of Physics
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1575303
Alternate Identifier(s):
OSTI ID: 1575916
Report Number(s):
BNL-212365-2019-JAAM
Journal ID: ISSN 2470-0010; PRVDAQ
Grant/Contract Number:  
SC0012704
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 100; Journal Issue: 9; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Benić, Sanjin, Hatta, Yoshitaka, Li, Hsiang-nan, and Yang, Dong -Jing. Single-spin asymmetries at two loops. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.100.094027.
Benić, Sanjin, Hatta, Yoshitaka, Li, Hsiang-nan, & Yang, Dong -Jing. Single-spin asymmetries at two loops. United States. doi:10.1103/PhysRevD.100.094027.
Benić, Sanjin, Hatta, Yoshitaka, Li, Hsiang-nan, and Yang, Dong -Jing. Fri . "Single-spin asymmetries at two loops". United States. doi:10.1103/PhysRevD.100.094027.
@article{osti_1575303,
title = {Single-spin asymmetries at two loops},
author = {Benić, Sanjin and Hatta, Yoshitaka and Li, Hsiang-nan and Yang, Dong -Jing},
abstractNote = {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.},
doi = {10.1103/PhysRevD.100.094027},
journal = {Physical Review D},
number = 9,
volume = 100,
place = {United States},
year = {2019},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.100.094027

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