Measurement of the B semileptonic branching fraction with lepton tags

CLEO Collaboration

Research output: Contribution to journalArticle

105 Citations (Scopus)

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¯.

Original languageEnglish
Pages (from-to)1570-1574
Number of pages5
JournalPhysical Review Letters
Volume76
Issue number10
DOIs
Publication statusPublished - 1996 Mar 4

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leptons
momentum
kinematics
mesons
detectors
decay
matrices
electrons

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

CLEO Collaboration. / Measurement of the B semileptonic branching fraction with lepton tags. In: Physical Review Letters. 1996 ; Vol. 76, No. 10. pp. 1570-1574.
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Measurement of the B semileptonic branching fraction with lepton tags. / CLEO Collaboration.

In: Physical Review Letters, Vol. 76, No. 10, 04.03.1996, p. 1570-1574.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Measurement of the B semileptonic branching fraction with lepton tags

AU - CLEO Collaboration

AU - Barish, B.

AU - Chadha, M.

AU - Chan, S.

AU - Eigen, G.

AU - Miller, J. S.

AU - O’grady, C.

AU - Urheim, J.

AU - Weinstein, A. J.

AU - Würthwein, F.

AU - Asner, D. M.

AU - Athanas, M.

AU - Bliss, D. W.

AU - Brower, W. S.

AU - Masek, G.

AU - Paar, H. P.

AU - Gronberg, J.

AU - Korte, C. M.

AU - Kutschke, R.

AU - Menary, S.

AU - Morrison, R. J.

AU - Nakanishi, S.

AU - Nelson, H. N.

AU - Nelson, T. K.

AU - Qiao, C.

AU - Richman, J. D.

AU - Roberts, D.

AU - Ryd, A.

AU - Tajima, H.

AU - Witherell, M. S.

AU - Balest, R.

AU - Cho, K.

AU - Ford, W. T.

AU - Lohner, M.

AU - Park, H.

AU - Rankin, P.

AU - Smith, J. G.

AU - Alexander, J. P.

AU - Bebek, C.

AU - Berger, B. E.

AU - Berkelman, K.

AU - Bloom, K.

AU - Browder, T. E.

AU - Cassel, D. G.

AU - Cho, H. A.

AU - Coffman, D. M.

AU - Crowcroft, D. S.

AU - Dickson, M.

AU - Drell, P. S.

AU - Dumas, D. J.

AU - Ehrlich, R.

PY - 1996/3/4

Y1 - 1996/3/4

N2 - 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¯.

AB - 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¯.

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DO - 10.1103/PhysRevLett.76.1570

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