Year: 1999
Type: article
Abstract: The importance of resonances for the radiative hyperon decays is examined in the framework of chiral perturbation theory. Low lying baryon resonances are included into the effective theory and tree contributions to these decays are calculated. We find significant contributions to both the parity-conserving and parity-violating decay amplitudes and a large negative value for the asymmetry parameter in polarized ${\ensuremath{\Sigma}}^{+}\ensuremath{\rightarrow}p\ensuremath{\gamma}$ is found, in agreement with the experimental result ${\ensuremath{\alpha}}_{\ensuremath{\gamma}}^{p{\ensuremath{\Sigma}}^{+}}=\ensuremath{-}0.76\ifmmode\pm\else\textpm\fi{}0.08.$
Authors: Buḡra Borasoy, Barry R. Holstein
Institution: University of Massachusetts Amherst
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2055019520