Spin of η(ς)-meson and decay modes of η- and ω-meson

Eight Ways of Determining theρ-Meson Coupling Constant

“…It is well known that the ratio of the 77°y mode to the 377 mode of the oo meson can be calculated using the p-dominance model of Gell-Mann, Sharp, and Wagner 19 and Hori et al 20 According to Yellin's numerical work, 21 r(co-77r)/r(co-^377) = [(^2/477)/(/ 2 /477) 2 ](98±6) (9) H with £ 2 /477~ 1/137. Experimentally this ratio is reported to be 4 (9.0±0.4)/90, hence/ p 2 /477 = 2.7±0.2.…”