2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/182074We calculate the parity-violating nucleon-nucleon potential in heavy-baryon chiral perturbation theory up to the next-to-next-to-leading order. The one-pion exchange comes in the 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 $\vec{n} p \to d γ$ at the threshold. The one-pion dominates the physical observable and the two-pion contribution is about or less than 10% of the one-pion contribution.3 pages, contribution to the workshop PAVI06 held in Milos island, Greece, May 16-20, 2006Nuclear TheoryHigh Energy Physics - PhenomenologyNuclear Experimenttext