Two-pion-exchange parity-violating potential and np → dγ |
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| Authors: | C. H. Hyun S. Ando B. Desplanques |
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| Affiliation: | (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 |
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| 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. |
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| Keywords: | 21.30.Fe Forces in hadronic systems and effective interactions 12.15.Ji Applications of electroweak models to specific processes |
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