We have measured the first and second moments of the hadronic mass-squared distribution in B→Xclv, for Plepton>1.5 GeV/c. We find(MX 2−MD −2)= 0.251 ± 0.66 GeV2,((MX 2−MX 2)2)=0.576 ± 0.170 GeV4, where M¯ Dis the spin-averaged D meson mass. From that first moment and the first moment of the photon energy spectrum in b→s γ, we find the heavy quark effective theory parameter λ1(in the modified minimal subtraction renormalization scheme, to order 1/MB 3and γ0αs 2) to be −0.24±0.11GeV2. Using these first moments and the B semileptonic width, and assuming parton-hadron duality, we obtain|Vcb|=0.0404±0.0013.

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Persistent URL dx.doi.org/10.1103/PhysRevLett.87.251808
Journal Physical Review Letters
Cronin-Hennessy, D. (D.), Lyon, A.L. (A. L.), Roberts, S. (S.), Thorndike, E.H. (E. H.), Coan, T.E. (T. E.), Fadeyev, V. (V.), … Shipsey, I.P.J. (I. P.J.). (2001). K-Shell photodetachment of Li−: Experiment and theory. Physical Review Letters, 87(25). doi:10.1103/PhysRevLett.87.251808