We revisit Sakurai's remark on the regularities of lepton-pair widths for
mesons, extending the panorama to radiative $X \to \gamma \gamma$ and total
decays. The regularities persist, and somehow surprisingly some of them seem to
relate with Fermi's constant -or $Z^0$-.Comment: 6 pages, 2 figure

Rivero, Alejandro

English

arXiv

We revisit Sakurai’s remark on the regularities of lepton-pair widths for mesons, extending the panorama to radiative X → γγ decays. The regularities persist, and somehow surprisingly some of them seem to relate with Fermi’s constant-or Z 0-. Back in 1978, Sakurai took the opportunity of a festscrift [11] to remark how the study of vector meson decays V → γ → e + e − , when extended to J/Ψ and Υ, seemed to have confirmed an empirical rule of Yennie [14] about the universality of Γ(V → e + e −). On other hand a universality in the effective coupling gXγγ for pseudoscalars X = π, η is well known popularly and we have recently noticed that it seems to extend to vector mesons, particularly to J/Ψ, when interpreted as a virtual process for total decay width. And also radiative transitions as Σ 0 → Λ 0 γ happen to be in the adequate range. Our purpose here is to review all the radiative decays well measured in the modern data tables in order to establish how significant these regularities are. 1 All total decay widths We can try to get some perspective by plotting all the decay rates of subnuclear particles. This can be done straightly from the tables provided by the particle data group [15] in its websit

Alejandro Rivero

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Regularities in electromagnetic decay widths

http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.81.3850

Regularities in electromagnetic decay widths

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