期刊
PHYSICAL REVIEW D
卷 100, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.100.094027
关键词
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资金
- nuclear theory group of Brookhaven National Laboratory
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-SC0012704]
- LDRD program of Brookhaven National Laboratory
- Ministry of Science and Technology of R. O. C. [MOST-107-2119-M-001-035-MY3]
- JSPS [17F17323]
- Grants-in-Aid for Scientific Research [17F17323] Funding Source: KAKEN
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 g(T) distribution function. In the k(T) 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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