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- Title
Two-pion-exchange parity-violating potential and np → dγ.
- Authors
Hyun, C.H.; Ando, S.; Desplanques, B.
- Abstract
We calculate the parity-violating nucleon-nucleon potential in heavy-baryon chiral perturbation theory up to next-to-next-to-leading order. The one-pion exchange enters in leading order and the next-to-next-to-leading order consists of two-pion-exchange and the two-nucleon contact terms. In order to investigate the effect of the higher-order contributions, we calculate the parity-violating asymmetry in n p → dγ at threshold. The one-pion-exchange contribution dominates the physical observable, while the two-pion-exchange contribution is about or less than 10% of the one-pion-exchange one.
- Subjects
PARTICLES (Nuclear physics); BARYONS; PIONS; ASTRONOMICAL perturbation; CELESTIAL mechanics
- Publication
European Physical Journal A -- Hadrons & Nuclei, 2007, Vol 32, Issue 4, p513
- ISSN
1434-6001
- Publication type
Article
- DOI
10.1140/epja/i2006-10426-8