Subleading corrections to parity-violating pion photoproduction
We compute the photon asymmetry Bγ for near threshold parity-violating (PV) pion photoproduction through subleading order. We show that subleading contributions involve a new combination of PV couplings not included in previous analyses of hadronic PV. We argue that existing constraints on the leading order contribution to Bγ—obtained from the PV γ-decay of 18F—suggest that the impact of the subleading contributions may be more significant than expected from naturalness arguments.
Additional Information© 2001 The American Physical Society Received 22 March 2001; published 2 August 2001 We thank J.-W. Chen, X. Ji, and J.L. Friar for several helpful conversations. This work was supported in part under U.S. Department of Energy Contract Nos. DE-AC05-84ER40150 and DE-FG02-00ER41146, the National Science Foundation, and a National Science Foundation Young Investigator Grant.
Published - ZHUprc01.pdf