Lattice QCD calculation of nuclear parity violation

We present a lattice QCD calculation of the leading-order momentum-independent parity-violating coupling between pions and nucleons, h(pi NN)(1). The calculation performs measurements on dynamical anisotropic clover gauge configurations, with a spatial extent of L similar to 2.5 fm, a spatial lattice spacing of a(s) similar to 0.123 fm, and a pion mass of m(pi) similar to 389 MeV. While this calculation does not include nonperturbative renormalization of the bare parity-violating operators, a chiral extrapolation to the physical pion mass, or contributions from disconnected (quark-loop) diagrams, these are expected to result in systematic errors within the quoted statistical error. We find a contribution from the connected diagrams of h(pi NN)(1,con) = (1.099 +/- 0.505(-0.064)(+0.058)) x 10(-7), consistent with current experimental bounds and previous model-dependent theoretical predictions.