Parity-violating photoproduction of pi(+/-) on the delta resonance.
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.
Zhu
S L
SL
Kellogg Radiation Laboratory 106-38, California Institute of Technology, Pasadena, California 91125, USA.
Maekawa
C M
CM
Holstein
B R
BR
Ramsey-Musolf
M J
MJ