Parity-violating photoproduction of pi(+/-) on the Delta resonance

作者：Zhu SL^*; Maekawa CM; Holstein BR; Ramsey Musolf MJ

来源：Physical Review Letters, 2001, 87(20): 201802.

DOI：10.1103/PhysRevLett.87.201802

We analyze the real-photon asymmetry A(gamma)(+/-) for the parity-violating (PV) pi (+/-) production on the Delta resonance via the reactions <(<gamma>)over right arrow> + p --> Delta (+) --> pi (+) + n and <(<gamma>)over right arrow> + d --> Delta (0) + p --> pi (-) + p + p. This asymmetry is nonvanishing due to a PV gammaN 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.

• 出版日期2001-11-12