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Anticipating future precise measurements of the D- and B-like (semi-)leptonicand hadronic decays for alternative determinations of the CKM mixing angles, wepursue our program on the D- and B-like mesons by improving the estimates off_{D*_(s)} and f_{B*_(s)} (analogue to f_\pi) by using the well-established(inverse) Laplace sum rules (LSR) and / or their suitable ratios less affectedby the systematics, which are known to N2LO pQCD and where the complete d = 6non-perturbative condensate contributions are included. The convergence of thePT series is analyzed by an estimate of the N3LO terms based on geometricgrowth of the coefficients. In addition to the standard LSR variable {\tau} andthe QCD continuum threshold t_c stability criteria, we extract our optimalresults by also requiring stability on the variation of the arbitrary QCDsubtraction point {\mu}. We complete the analysis by a direct estimate off_{B_c}. Our results summarized in Tables III and IV are compared with someother recent estimates.

Improved f_{D*_(s)}, f_{B*_(s)} and f_{B_c} from QCD Laplace sum rules

Improved f_{D_(s)}, f_{B_(s)} and f_{B_c} from QCD Laplace sum rules