%0 Journal Article
%T Revisiting f_B and m_b(m_b) from HQET spectral sum rules
%+ Laboratoire Univers et Particules de Montpellier (LUPM)
%A Narison, Stephan
%Z 8 pages, 9 figures, 5 tables. Extended and Revised version which matches with the published one in PLB
%< avec comité de lecture
%Z LUPM:13-064
%@ 0370-2693
%J Physics Letters B
%I Elsevier
%V 721
%N 4-5
%P 269-276
%8 2013
%D 2013
%Z 1212.5544
%R 10.1016/j.physletb.2013.03.026
%Z Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
%Z Physics [physics]/High Energy Physics - Experiment [hep-ex]
%Z Physics [physics]/High Energy Physics - Lattice [hep-lat]
%Z Physics [physics]/Nuclear Experiment [nucl-ex]Journal articles
%X Using recent values of the QCD (non-) perturbative parameters given in Table 1, we reconsider the extraction of f_B and the on-shell mass M_b from HQET Laplace spectral sum rules known to N2LO PT series and including dimension 7 condensates in the OPE. We especially study the convergence of the PT series, the effects on "different spectral sum rules data" of the continuum threshold and subtraction point varied in a larger range than in the existing literature and include in the error an estimate of the N3LO PT series based on a geometric growth 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 limit M_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 in good agreement with the ones from QCD spectral sum rules (QSSR) in full QCD to the same order from the same channel [1]: f_B^{qcd}=206(7) MeV and m_b(m_b)^{qcd}=4236(69) MeV.
%G English
%L hal-00932027
%U https://hal.science/hal-00932027
%~ IN2P3
%~ CNRS
%~ UNIV-MONTP2
%~ LUPM
%~ MIPS
%~ UNIV-MONTPELLIER
%~ LUPM_IFAC
%~ UM1-UM2