Determination of the mass, width, and (ΣπΛπ) branching ratio of theΣ(1381)baryon

The mass, width, and ($\frac{\Sigma \pi }{\Lambda \pi }$) branching ratio of the $Y_1^{*}$ or $\Sigma \mathrm{}\left(1381\right)\mathrm{}$ are reported from a large-statistics sample for which systematic effects are included. The mass values for $Y_1^{*+}$, $Y_1^{*-}$, and $Y_1^{*0\mathrm{}}$ are found to be 1381 ± 1 MeV, 1383 ± 2 MeV, and 1380 ± 2 MeV, respectively; an average width of 34 ± 2 MeV is found. The $\Sigma \pi$ branching fraction is found to be 0.17 ± 0.04. Good agreement between the latest experimental data for the $J^P=\frac{3}{2^{+}}$ decimet and the expectations of S${\mathrm{U}}_3$ is obtained by using equal spacing in mass squared and by using the average of the cube of the decay momenta in comparing the partial widths.