Measurement of the First and Second Moments of the Hadronic Mass Distribution in Semileptonic B Decays
- SLAC
We report a preliminary measurement of the first and second moments of the hadronic mass distributions in B {yields} X{sub c}{ell}{nu} decays. The measurements are based on {Upsilon}(4S) {yields} B{bar B} events where the hadronic decay of one of the B mesons is fully reconstructed and a charged lepton from the decay of the other B meson is identified. The moments are presented for threshold lepton momenta ranging from 0.9 to 1.6 GeV. From the <M{sub X}{sup 2}> moments we determine the non-perturbative Heavy Quark Expansion (HQE) parameters, {bar {Lambda}} and {lambda}{sub 1}. We combine the measured moments <M{sub X}{sup 2}> with earlier BABAR measurements of the semileptonic branching ratios and B lifetimes and perform a simultaneous fit to the HQE for the moments obtained for different threshold lepton momenta and the semileptonic decay width. This fit results in an improved value for the CKM matrix element |V{sub cb}|.
- Research Organization:
- Stanford Linear Accelerator Center, Menlo Park, CA (US)
- Sponsoring Organization:
- USDOE Office of Science (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 813319
- Report Number(s):
- SLAC-PUB-10067
- Country of Publication:
- United States
- Language:
- English
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