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 nextto- 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 np → 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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