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The relativistic string Hamiltonian is used to calculate the masses and decayconstants of $B_q$ mesons: they appear to be expressed through onlythreefundamental values: the string tension $\sigma $, $\alpha_s$, and the quarkpole masses. The values $f_B =186 $ MeV, $f_{B_s}= 222$ MeV are calculatedwhile $f_{B_c}$ depends on the $c$-quark pole mass used, namely $f_{B_c}=440(424)$ MeV for $m_c =1.40 (1.35)$ GeV. For the $1P$ states we predict thespin-averaged masses: $\bar M(B_J)=5730$ MeV and $\bar M(B_{sJ})=5830$ MeVwhich are in good agreement with the recent data of the D0 and CDFCollaborations, at the same time owning to the string correction being by $\sim50$ MeV smaller than in other calculations.Comment: 9 pages, ICHEP 200

MASSES AND DECAY CONSTANTS OF Bq MESONS IN QCD STRING APPROACH

MASSES AND DECAY CONSTANTS OF B_q MESONS IN QCD STRING APPROACH