Cs. Huang et al., Reanalysis of the four-quark operators relevant to the Lambda(b) lifetime from the QCD sum rule - art. no. 054004, PHYS REV D, 6105(5), 2000, pp. 4004
The Lambda(b) matrix element of the four-quark operator relevant to its lif
etime is reanalyzed by the QCD sum rule method. The new ingredients introdu
ced are that (1) more vacuum condensates are considered, (2) a different qu
ark-hadron duality is adopted, and (3) the possible deviation from the vacu
um saturation assumption for the four quark condensates is considered. With
kappa(1) = 4 the related hadronic parameter r is calculated to be (3.6 +/-
0.9), and the lifetime ratio tau(Lambda(b))/tau(B-0) = (0.83 +/- 0.04), wh
ich is consistent with experimental data.