The Leptonic, Hadronic, and Radiative Decay of the Bb-Bar Quarkonium.

Data from the CLEO detector at the Cornell Electron Storage Ring have been used to measure the branching ratios of hadronic decay, branching ratios of leptonic decays and radiative decays of the (UPSILON)(2S). These branching ratios are: Br((UPSILON)(2S) (--->) (pi)('+)(pi)('-)(UPSILON)(1S)); Br((UPSILON)(2S) (--->) (mu)('+)(mu)('-)); Br((UPSILON)(1S) (--->) (mu)('+)(mu)('-)); and Br(2('3)S (--->) (gamma)(gamma)1('3)S). For the transition of (UPSILON)(2S) (--->) (UPSILON)(1S)(eta) we give an upper limit on the branching ratio. We have measured the mass difference between the (UPSILON)(2S) and the (UPSILON)(1S) with a much higher accuracy than the CESR measurement. Using the reaction e('+)e('-) ( --->) (mu)('+)(mu)('-) we have looked for the electroweak asymmetry at 10 GeV C.M. energy. The result shows evidence of the existence of the weak neutral current in the e('+)e(' -) collisions at CLEO. The properties of the (pi)(pi) system in the transition (UPSILON)(2S) (--->) (pi)(pi)(UPSILON)(1S) and (UPSILON)(3S) (--->) (pi)(pi)(UPSILON)(1S) have been studied. A detailed discussion of the different properties of the (pi)(pi) system in the (UPSILON)(2S) and the (UPSILON)(3S) cases is presented. The data give a good demonstra- tion of the chiral symmetry property in the decay (UPSILON)(2S) (--->) (pi)(pi)(UPSILON)(1S), while the (UPSILON)(3S) ( --->) (pi)(pi)(UPSILON)(1S) does not.