We discuss the QCD sum rule calculation of the heavy‐quark effective theory parameters λ_E and λ_H, which represent quark‐gluon three‐body components in the B‐meson wave function. We update the sum rules for λ_(E,H) calculating the new higher‐order contributions to the operator product expansion for the corresponding correlator, i.e., the order α_s radiative corrections to the Wilson coefficients associated with the dimension‐5 quark‐gluon mixed condensate, and the power corrections due to the dimension‐6 vacuum condensates. We find that the new radiative corrections significantly improve stability of the corresponding Borel sum rules, modifying the values of λ_(E,H).
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