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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">B</mml:mi></mml:math>Decay and the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">ϒ</mml:mi></mml:math>Mass
Theoretical predictions for inclusive semileptonic $B$ decay rates are rewritten in terms of the $\ensuremath{\Upsilon}(1S)$ meson mass instead of the $b$ quark mass, using a modified perturbation expansion. This method gives theoretically consistent and phenomenologically useful results. Perturbation theory is well behaved, and the largest theoretical error in the predictions …