Exchange currents in radiative hyperon decays and hyperon charge radii

Details Exchange currents in radiative hyperon decays and hyperon charge radii Exchange currents in radiative hyperon decays and hyperon charge radii

1998-10-06

arxiv.org/abs/nucl-th/9810017v1

Physics

Nuclear Physics

Nuclear Theory

4 pages, 1 eps figure, LaTeX, uses b98proc.cls, contribution to Baryons'98, Bonn, Sept.22-26,1998, proceedings to be published

Scientific paper

Radiative decays of decuplet hyperons and octet hyperon charge radii are evaluated in a chiral constituent quark model emphasizing the role of exchange currents. Exchange currents largely cancel for the M1 decay amplitudes, while they dominate the E2 amplitude. Due to the pseudoscalar meson cloud the charge radii of Sigma^- and Xi^- are almost as large as the proton radius, in agreement with recent experimental results from SELEX. Strangeness suppression is weakened by exchange currents for several observables.

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