Abstract
The parity-violating nucleon–nucleon (NN) potential is considered up to next-to-next-to leading order in heavy-baryon chiral perturbation theory. We include one-pion exchange at leading order and the two-pion exchange and two-nucleon contact terms at next-to-next-to-leading order. The effects of intermediate (two-pion exchange) and short-range (two-nucleon contact) terms are probed by calculating the photon asymmetry Aγ in n→p→dγ employing Siegert's theorem and an accurate phenomenological potential for the parity-conserving NN interaction. We explore in detail the uncertainties due to the parameters that control the contribution of the short-range interaction. We obtain about 20% uncertainty in the value of Aγ up to the next-to-next-to leading order. We discuss the implication of this uncertainty for the determination of the weak pion–nucleon coupling constant and how the uncertainty can be reduced.
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