${{\mathit \eta}^{\,'}{(958)}}$ $\rightarrow$ invisible  Decay Mode Summary INSPIRE   PDGID:
M002.200
Mode Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{30}$ ${{\mathit \eta}^{\,'}{(958)}}$ $\rightarrow$ invisible $<6 \times 10^{-4}$ CL= 90%
The following data is related to the above value:
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$\Gamma($ ${{\mathit \eta}^{\,'}{(958)}}$ $\rightarrow$ invisible$)/\Gamma($ ${{\mathit \eta}^{\,'}{(958)}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}}$ $)$
$\Gamma_{30}/\Gamma_{1}$
$\Gamma($ ${{\mathit \eta}^{\,'}{(958)}}$ $\rightarrow$ invisible$)/\Gamma($ ${{\mathit \eta}^{\,'}{(958)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)$
$\Gamma_{30}/\Gamma_{7}$
$\Gamma($ ${{\mathit \eta}^{\,'}{(958)}}$ $\rightarrow$ invisible$)/\Gamma_{\text{total}}$
$\Gamma_{30}/\Gamma$