Leptonic, hadronic, and radiative decay of the b anti-b 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) → π+π- Upsilon(1S)); Br(Upsilon(2S) → μ+μ-); Br(Upsilon(1S) → μ+μ-); and Br(23S → γγ13S). 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+e2] → μ+μ- we have looked for the electroweak asymmetry at 10 GeV CM energy. The result shows evidence of the existence of the weak neutral current in the e+e- collisions at CLEO. The properties of the ππ system in the transition Upsilon(2S) → ππUpsilon(1S) and Upsilon(3S) → ππUpsilon(1S) have been studied. A detailed discussion of the different properties of the ππ system in the Upsilon(2S) and the Upsilon(3S) cases is presented. The data give a good demonstration of the chiral symmetry property in the decay Upsilon(2S) → ππUpsilon(1S), while the Upsilon(3S) → ππUpsilon(1S) does not