Two-pion-exchange parity-violating potential and np → dγ
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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.
PACS.21.30.Fe Forces in hadronic systems and effective interactions 12.15.Ji Applications of electroweak models to specific processes
- 11.C.H. Hyun, S. Ando, B. Desplanques, nucl-th/0611018, to be published in Phys. Lett. B.Google Scholar