期刊
PHYSICAL REVIEW C
卷 93, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.93.015501
关键词
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资金
- U.S. Department of Energy, Office of Nuclear Physics [DE-AC05-06OR23177, DE-AC52-06NA25396]
- National Science Foundation [PHY-1068305]
- Jefferson Science Associates Theory Fellowship
- Direct For Mathematical & Physical Scien
- Division Of Physics [1068305] Funding Source: National Science Foundation
Two-nucleon axial charge and current operators are derived in chiral effective field theory up to one loop. The derivation is based on time-ordered perturbation theory and accounts for cancellations between the contributions of irreducible diagrams and the contributions owing to nonstatic corrections from energy denominators of reducible diagrams. Ultraviolet divergencies associated with the loop corrections are isolated in dimensional regularization. The resulting axial current is finite and conserved in the chiral limit, while the axial charge requires renormalization. A complete set of contact terms for the axial charge up to the relevant order in the power counting is constructed.
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