#### Search for ${{\mathit X}^{0}}$ Resonance in Quarkonium Decays

Limits are for branching ratios to modes shown. Spin 1 is assumed for ${{\mathit X}^{0}}$ .
VALUE CL% DOCUMENT ID TECN  COMMENT
• • We do not use the following data for averages, fits, limits, etc. • •
$<3 \times 10^{-5} - 6 \times 10^{-3}$ 90 1
 1995
CLE2 ${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit X}^{0}}{{\overline{\mathit X}}^{0}}{{\mathit \gamma}}$ , ${\mathit m}_{{{\mathit X}^{0}}}<$ 3.9 GeV
 1 BALEST 1995 three-body limit is for phase-space photon energy distribution and angular distribution same as for ${{\mathit \Upsilon}}$ $\rightarrow$ ${{\mathit g}}{{\mathit g}}{{\mathit \gamma}}$ .
References:
 BALEST 1995
PR D51 2053 ${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ $+$ noninteracting particles