@article{46de062faa1942afb909a70628d428a3,
title = "Measurement of the B semileptonic branching fraction with lepton tags",
abstract = "We have used the CLEO II detector and 2.06fb−1 of ϒ(4S) data to measure the B-meson semileptonic branching fraction. The B → Xeν momentum spectrum was obtained over nearly the full momentum range by using charge and kinematic correlations in events with a high-momentum lepton tag and an additional electron. We find B (B → Xeν) = (10.49 ± 0.17 ± 0.43)%, with overall systematic uncertainties less than those of untagged single-lepton measurements. We use this result to calculate the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element Vcb and to set an upper limit on the fraction of ϒ(4S) decays to final states other than BB¯.",
author = "{CLEO Collaboration} and B. Barish and M. Chadha and S. Chan and G. Eigen and Miller, {J. S.} and C. O{\textquoteright}grady and J. Urheim and Weinstein, {A. J.} and F. W{\"u}rthwein and Asner, {D. M.} and M. Athanas and Bliss, {D. W.} and Brower, {W. S.} and G. Masek and Paar, {H. P.} and J. Gronberg and Korte, {C. M.} and R. Kutschke and S. Menary and Morrison, {R. J.} and S. Nakanishi and Nelson, {H. N.} and Nelson, {T. K.} and C. Qiao and Richman, {J. D.} and D. Roberts and A. Ryd and H. Tajima and Witherell, {M. S.} and R. Balest and K. Cho and Ford, {W. T.} and M. Lohner and H. Park and P. Rankin and Smith, {J. G.} and Alexander, {J. P.} and C. Bebek and Berger, {B. E.} and K. Berkelman and K. Bloom and Browder, {T. E.} and Cassel, {D. G.} and Cho, {H. A.} and Coffman, {D. M.} and Crowcroft, {D. S.} and M. Dickson and Drell, {P. S.} and Dumas, {D. J.} and H. Yamamoto",
year = "1996",
month = mar,
day = "4",
doi = "10.1103/PhysRevLett.76.1570",
language = "English",
volume = "76",
pages = "1570--1574",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "10",
}