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In this talk, I present new results [1] obtained from QCD spectral sum rules(QSSR), on the bag constant parameters entering in the analysis of theB^0_{(s)}-\bar B^0_{(s)} mass-differences. Taking the average of the resultsfrom the Laplace and moment sum rules, one obtains to order \alpha_s:f_B\sqrt{\hat B_B}= (228 +- 61) MeV, f_{B_s}\sqrt{B_{B_s}}/{f_{B}\sqrt{B_{B}}=1.18 +- 0.03, in units where f_\pi=130.7 MeV. Combined with the experimentaldata on the mass-differences \Delta M_{d,s}, one obtains the constraint on theCKM weak mixing angle: |V_{ts}/V_{td}|^2 > 20.2(1.3). Alternatively, using theweak mixing angle from the analysis of the unitarity triangle and the data on\Delta M_d, one predicts \Delta M_s=18.3(2.1) ps^{-1} in agreement with thepresent experimental lower bound and within the reach of Tevatron 2.Comment: Latex 2e, 4 pages. Talk presented at the 1st High-Energy Physics  Madagascar International Conference Series (HEP-MAD'01), 27th sept-5th Oct.  2001, Antananarivo (to appear in World Scientific Proceedings

STATUS OF THE $B^{0}_{(S)}-\bar{B}^{0}_{(S)}$ MIXING FROM QCD SPECTRAL SUM RULES