Heavy-light mesons and quark constantsf B,f D in the vacuum correlator method

Quark constantsf _M and masses ofB, D, andD _S mesons are calculated using the vacuum correlator method, suggested recently for long-distance nonperturbative QCD. The dynamical input is standard current quark masses, string tension and _s( _QCD). The electronic width of , and calculated with the same parameters agrees with experiment. Hyperfine splitting ofD, D _s mesons is also reproduced. The resulting values off _B,f _D,f _Ds are 0.17, 0.21 and 0.25 GeV, respectively;f _D andf _Ds are within recent experimental bounds. It is shown thatf _M does obey the asymptoticM ^–1/2 law forM>5 GeV.