https://doi.org/10.1140/epja/i2006-10426-8
PAVI 2006
Two-pion-exchange parity-violating potential and np → dγ
1
Department of Physics and Institute of Basic Science, Sungkyunkwan University, 440-746, Suwon, Korea
2
Laboratoire de Physique Subatomique et de Cosmologie, F-38026, Grenoble Cedex, France
* e-mail: hch@meson.skku.ac.kr
Received:
31
August
2006
Accepted:
18
March
2007
Published online:
10
July
2007
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 –
© Società Italiana di Fisica and Springer-Verlag, 2007
