${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit X}}{{\overline{\mathit X}}}$ (${\mathit m}_{{{\mathit X}}}<$ 4.5 GeV)  Decay Mode Summary INSPIRE   JSON  (beta) PDGID:
M049.127
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{120}$ ${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit X}}{{\overline{\mathit X}}}$ (${\mathit m}_{{{\mathit X}}}<$ 4.5 GeV) $<2.4 \times 10^{-4}$ CL= 90%
Category: Radiative decays
Note: ${{\mathit X}}$ and ${{\overline{\mathit X}}}$ = zero spin with ${\mathit m}_{\mathrm {}}$ $<$ 4.5 GeV
The following data is related to the above value:
$\Gamma({{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit X}}{{\overline{\mathit X}}}$ (${\mathit m}_{{{\mathit X}}}<$ 4.5 GeV)$)/\Gamma_{\text{total}}$
$\Gamma_{120}/\Gamma$