We measure the primary lepton momentum spectrum in [Formula Presented] decays, for [Formula Presented] in the B rest frame. From this, we calculate various moments of the spectrum. In particular, we find [Formula Presented] and [Formula Presented] We use these moments to determine non-perturbative parameters governing the semileptonic width. In particular, we extract the heavy quark expansion parameters [Formula Presented] and [Formula Presented] The theoretical constraints used are evaluated through order [Formula Presented] in the non-perturbative expansion and [Formula Presented] in the perturbative expansion. We use these parameters to extract [Formula Presented] from the world average of the semileptonic width and find [Formula Presented] In addition, we extract the short range b-quark mass [Formula Presented] Finally, we discuss the implications of our measurements for the theoretical understanding of inclusive semileptonic processes.

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Persistent URL dx.doi.org/10.1103/PhysRevD.67.072001
Journal Physical Review D - Particles, Fields, Gravitation and Cosmology
Mahmood, A.H. (A. H.), Csorna, S.E. (S. E.), Danko, I. (I.), Bonvicini, G. (G.), Cinabro, D. (D.), Dubrovin, M. (M.), … Wang, J.C. (J. C.). (2003). Measurement of lepton momentum moments in the decay [Formula Presented] and determination of the heavy quark expansion parameters and [Formula Presented]. Physical Review D - Particles, Fields, Gravitation and Cosmology, 67(7). doi:10.1103/PhysRevD.67.072001