${{\mathit \Upsilon}{(4S)}}$ $\rightarrow$ ${{\mathit \Upsilon}{(1S)}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$   Decay Mode Summary INSPIRE   PDGID:
M047.7
Mode Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{18}$ ${{\mathit \Upsilon}{(4S)}}$ $\rightarrow$ ${{\mathit \Upsilon}{(1S)}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ ($8.2$ $\pm0.4$) $ \times 10^{-5}$ 1026
The following data is related to the above value:
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$\Gamma($ ${{\mathit \Upsilon}{(4S)}}$ $\rightarrow$ ${{\mathit \Upsilon}{(1S)}}{{\mathit \eta}}$ $)/\Gamma($ ${{\mathit \Upsilon}{(4S)}}$ $\rightarrow$ ${{\mathit \Upsilon}{(1S)}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $)$
$\Gamma_{19}/\Gamma_{18}$
$\Gamma($ ${{\mathit \Upsilon}{(4S)}}$ $\rightarrow$ ${{\mathit \Upsilon}{(2S)}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $)/\Gamma($ ${{\mathit \Upsilon}{(4S)}}$ $\rightarrow$ ${{\mathit \Upsilon}{(1S)}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $)$
$\Gamma_{21}/\Gamma_{18}$
$\Gamma($ ${{\mathit \Upsilon}{(4S)}}$ $\rightarrow$ ${{\mathit \Upsilon}{(1S)}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{18}/\Gamma$