Hadronic mass moments in inclusive semileptonic B meson decays -: art. no. 251808

We have measured the first and second moments of the hadronic mass-squared distribution in B --> X(c)l nu, for P-lepton > 1.5 GeV/c. We find (M-x(2) - (M) over bar (2)(D)) = 0.251 +/- 0.066 GeV2, ((M-X(2) - (M-X(2))(2)) = 0.576 +/- 0.170 GeV4, where (M) over bar (D) is the spin-averaged D meson mass. From that first moment and the first moment of the photon energy spectrum in b --> s gamma, we find the heavy quark effective theory parameter lambda (1) (in the modified minimal subtraction renormalization scheme, to order 1/M-B(3) and beta (o)alpha (2)(s)) to be -0.24 +/- 0.11 GeV2. Using these first moments and the B semileptonic width, and assuming parton-hadron duality, we obtain \V-cb\ = 0.0404 +/- 0.0013.