Title

Measurement of B-Meson semileptonic decay

Document Type

Article

Publication Date

1-1-1981

Abstract

Using the Colubia University-Stony Brook detector we have measured the production of energetic electrons (E>1 GeV) in e+e- annihilations in the center-of-mass energy range 10.4 to 11.4 GeV. We observe an enhanced electron signal at the ′′′(4S) resonance, which we interpret as evidence for the β decay of a new flavor of quark, b, bound within a new flavor meson, B. We derive a branching ratio for B→Xeν of (13.6 ± 2.5 ± 3)%. The observed energy spectrum of the electrons favors the decay b→ceν over b→ueν. © 1981 The American Physical Society.

Publication Source (Journal or Book title)

Physical Review Letters

First Page

771

Last Page

774

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