title: Parity-violating photoproduction of pi(+/-) on the delta resonance.
abstract: We analyze the real-photon asymmetry A(gamma)(+/-) for the parity-violating (PV) pi(+/-) production on the Delta resonance via the reactions (-->)gamma + p --> Delta(+) --> pi(+) + n and (-->)gamma + d --> Delta(0) + p --> pi(-) + p + p. This asymmetry is nonvanishing due to a PV gamma N Delta coupling constant, d(Delta)(+/-). We argue that an experimental determination of this coupling would be of interest for hadron dynamics, possibly shedding light on the S-wave/ P-wave puzzle in the hyperon nonleptonic decays and the violation of Hara's theorem in weak radiative hyperon decays.
authors.affiliation: Kellogg Radiation Laboratory 106-38, California Institute of Technology, Pasadena, California 91125, USA.
authors.forename: S L
authors.initials: SL
authors.lastname: Zhu
authors.forename: C M
authors.initials: CM
authors.lastname: Maekawa
authors.forename: B R
authors.initials: BR
authors.lastname: Holstein
authors.forename: M J
authors.initials: MJ
authors.lastname: Ramsey-Musolf