An Effective Field Theory Calculation of the Parity Violating Asymmetry in n+p -> d+gamma
David B. Kaplan, Martin J. Savage, Roxanne P. Springer, Mark B. Wise
Abstract
Weak interactions are expected to induce a parity violating pion-nucleon coupling, hπNN(1). This coupling should be measurable in a proposed experiment to study the parity violating asymmetry Aγin the process n + p d+γ. We compute the leading dependence of Aγon the coupling hπNN(1) using recently developed effective field theory techniques and find an asymmetry of Aγ= +0.17 hπNN(1) at leading order. This asymmetry has the opposite sign to that given by Desplanques, Donoghue and Holstein.
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