Abstract
Within the framework of the multipole expansion of quantum chromodynamics, we propose a model to compute the rates of hadronic transitions in the b b ¯ system and heavier QQ states. Rates and estimated branching ratios of various transitions are given. The predicted result for ϒ′;→ϒπ π agrees with recent measurements. We discuss the spin-flip π π transitions ϒ″→1 1 P 1π π and 2 3 P J →1 1 S 0 π π which can be used to reach the spin-singlet states 1 1 P 1 and 1 1 S 0 .
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