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Regularities in electromagnetic decay widths

Alejandro Rivero

hep-pharXiv:hep-ph/0603145

Abstract

We revisit Sakurai's remark on the regularities of lepton-pair widths for mesons, extending the panorama to radiative X γγ and total decays. The regularities persist, and somehow surprisingly some of them seem to relate with Fermi's constant -or Z0-.

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