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Using recent values of the QCD (non-) perturbative parameters given in Table1 and an estimate of the N3LO QCD perturbative contributions based on thegeometric growth of the PT series, we re-use QCD spectral sum rules (QSSR)known to N2LO PT series and including all dimension-six NP condensatecontributions in the full QCD theory, for improving the existing estimates of{m}_{c,b} and f_{D_(s)}, f_{B_(s)} from the open charm and beauty systems. Weespecially study the effects of the subtraction point on "different QSSR data"and use (for the first time) the Renormalization Group Invariant (RGI) scaleindependent quark masses in the analysis. The estimates [rigourousmodel-independent upper bounds within the SVZ framework] reported in Table 8:f_D/f_\pi=1.56(5)[< 1.68(1)], f_B/f_\pi=1.58(5)[< 1.80(3)] and f_{D_s}/f_K=1.58(4) [< 1.63(1)], f_{B_s}/f_K=1.50(3)[< 1.61(3.5)], which improve previousQSSR estimates, are in perfect agreement (in values and precisions) with someof the experimental data on f_{D,D_s} and on recent lattice simulations withindynamical quarks. These remarkable agreements confirm both the success of theQSSR semi-approximate approach based on the OPE in terms of the quark and gluoncondensates and of the Minimal Duality Ansatz (MDA) for parametrizing thehadronic spectral function which we have tested from the complete data of theJ/\psi and \Upsilon systems. The values of the running quark massesm_c(m_c)=1286(66) MeV and m_b(m_b)= 4236(69) MeV from M_{D,B} are in goodagreement though less accurate than the ones from recent J/\psi and \Upsilonsum rules.

A fresh look into m_{c,b} and precise f_{D_(s),B_(s)} from heavy-light QCD spectral sum rules