Measurements of Semileptonic B Decays with Lepton Tags

Details Measurements of Semileptonic B Decays with Lepton Tags Measurements of Semileptonic B Decays with Lepton Tags

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apri14005s&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Using a sample of 10 million Υ(4S) decays collected with the CLEO II detector, we have made new measurements of the branching fraction and the lepton-energy moments for B arrow Xc e ν. The electron energy spectrum for inclusive semileptonic B decays was obtained by exploiting charge and kinematic correlations in Υ(4S) events that have both a high-energy lepton and an additional electron. From the total yield we obtain the B semileptonic branching fraction, and from the lepton-energy moments we calculate the Heavy Quark Effective Theory (HQET) parameters barΛ and λ_1. Our results are compared with theoretical expectations and previous measurements. The inclusive branching fraction and HQET parameters may be used to extract |V_cb| within the framework of HQET, subject to the assumption of quark-hadron duality. -------------------------------

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