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The lifetime differences of bottom hadrons are known to be properly explainedwithin the framework of heavy quark effective field theory(HQEFT) of QCD viathe inverse expansion of the dressed heavy quark mass. In general, the spectrumaround the endpoint region is not well behaved due to the invalidity of $1/m_Q$expansion near the endpoint. The curve fitting method is adopted to treat theendpoint behavior. It turns out that the endpoint effects are truly small andthe explanation on the lifetime differences in the HQEFT of QCD is then welljustified. The inclusion of the endpoint effects makes the prediction on thelifetime differences and the extraction on the CKM matrix element $|V_{cb}|$more reliable.Comment: 11 pages, Revtex, 10 figures, 6 tables, published versio

LIFETIME DIFFERENCE AND ENDPOINT EFFECT IN THE INCLUSIVE BOTTOM HADRON DECAYS