Reanalysis of the Four-Quark Operators Relevant to Λ_b Lifetime from QCD Sum Rule

Details Reanalysis of the Four-Quark Operators Relevant to Λ_b Lifetime from QCD Sum Rule Reanalysis of the Four-Quark Operators Relevant to Λ_b Lifetime from QCD Sum Rule

1999-06-09

arxiv.org/abs/hep-ph/9906300v2

Phys.Rev. D61 (2000) 054004

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, revtex, one figure, more discussions and references added

Scientific paper

10.1103/PhysRevD.61.054004

\Lambda_b matrix element of four-quark operator relevant to its lifetime is reanalyzed by QCD sum rule. The new ingredients introduced are that (1) more vacuum condensates are considered; (2) different quark-hadron duality is adopted; and (3) the possible deviation from the vacuum saturation assumption for the four quark condensates is considered. With \kappa_1=4 the related hadronic 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 the experimental data.

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