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\Lambda_b matrix element of four-quark operator relevant to its lifetime isreanalyzed by QCD sum rule. The new ingredients introduced are that (1) morevacuum condensates are considered; (2) different quark-hadron duality isadopted; and (3) the possible deviation from the vacuum saturation assumptionfor the four quark condensates is considered. With \kappa_1=4 the relatedhadronic parameter r is calculated to be 3.6 \pm 0.9, and the lifetime ratio\tau(\Lambda_b)/\tau(B^0) = 0.83 \pm 0.04, which is consistent with theexperimental data.Comment: 12 pages, revtex, one figure, more discussions and references adde

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Reanalysis of the four-quark operators relevant to the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Λ</mml:mi></mml:mrow><mml:mrow><mml:mi>b</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>lifetime from the QCD sum rule

Reanalysis of the four-quark operators relevant to theΛblifetime from the QCD sum rule