$\Gamma($ ${{\mathit Z}}$ $\rightarrow$ ${{\mathit B}^{*}}$ X$)/[\Gamma($ ${{\mathit Z}}$ $\rightarrow$ ${{\mathit B}}$ X$)$+ $\Gamma($ ${{\mathit Z}}$ $\rightarrow$ ${{\mathit B}^{*}}$ X$)\rbrack{}$
$\Gamma_{49}/(\Gamma_{48}$+ $\Gamma_{49}$)