Phys. Rev. Lett. 64, 16–20 (1990)Observation of B-meson semileptonic decays to noncharmed final statesReceived 8 November 1989; published in the issue dated 1 January 1990 We report the first evidence of charmless semileptonic decays of B mesons. In the momentum interval 2.4–2.6 GeV/c where the background from b→clν is negligible, the average of the measured b→ueν and b→uμν partial branching ratios is ΔBub(2.4,2.6) =(1.8±0.4±0.3)×10-4. Inclusion of data from the interval 2.2–2.4 GeV/c, where the lepton yield is dominated by b→clν, gives ΔBub(2.2,2.6) =(3.3±0.8±0.8)×10-4. ‖Vub/Vcb‖ depends on the theoretical model of b→ulν decay and is approximately 0.1. © 1990 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.64.16
DOI:
10.1103/PhysRevLett.64.16
PACS:
13.20.Jf, 12.15.Ff, 14.40.Jz
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