Exchange currents in radiative hyperon decays and hyperon charge radii
Nuclear Theory
2007-05-23 v1 High Energy Physics - Phenomenology
Abstract
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.
Keywords
Cite
@article{arxiv.nucl-th/9810017,
title = {Exchange currents in radiative hyperon decays and hyperon charge radii},
author = {Georg Wagner},
journal= {arXiv preprint arXiv:nucl-th/9810017},
year = {2007}
}
Comments
4 pages, 1 eps figure, LaTeX, uses b98proc.cls, contribution to Baryons'98, Bonn, Sept.22-26,1998, proceedings to be published by World Scientific