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Using recent values of the QCD (non-) perturbative parameters given in Table1, we reconsider the extraction of f_B and the on-shell mass M_b from HQETLaplace spectral sum rules known to N2LO PT series and including dimension 7condensates in the OPE. We especially study the convergence of the PT series,the effects on "different spectral sum rules data" of the continuum thresholdand subtraction point varied in a larger range than in the existing literatureand include in the error an estimate of the N3LO PT series based on a geometricgrowth of the PT series. We obtain the Renormalization Group Invariant (RGI)universal coupling : \hat f_B^\infty=0.416(60) GeV^{3/2} in the static limitM_b \to \infty and the physical decay constant including 1/M_b corrections:f_B^{hqet}=199(29) MeV. Using the ratio of sum rules, we obtain, to order\alpha_s^2, the running mass m_b(m_b)=4213(59) MeV. The previous results are ingood agreement with the ones from QCD spectral sum rules (QSSR) in full QCD tothe same order from the same channel [1]: f_B^{qcd}=206(7) MeV andm_b(m_b)^{qcd}=4236(69) MeV.

Revisiting f_B and m_b(m_b) from HQET spectral sum rules