Semileptonic Branching Fraction of Charged and Neutral B Mesons

Details Semileptonic Branching Fraction of Charged and Neutral B Mesons Semileptonic Branching Fraction of Charged and Neutral B Mesons

1994-06-23

arxiv.org/abs/hep-ex/9406004v1

Phys.Rev.Lett.73:3503-3507,1994; ERRATUM-ibid.74:3090,1995

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages (in REVTEX format) Preprint CLNS94-1286, CLEO 94-16

Scientific paper

10.1103/PhysRevLett.73.3503

An examination of leptons in ${\Upsilon (4S)}$ events tagged by reconstructed $B$ decays yields semileptonic branching fractions of $b_-=(10.1 \pm 1.8\pm 1.4)\%$ for charged and $b_0=(10.9 \pm 0.7\pm 1.1)\%$ for neutral $B$ mesons. This is the first measurement for charged $B$. Assuming equality of the charged and neutral semileptonic widths, the ratio $b_-/b_0=0.93 \pm 0.18 \pm 0.12$ is equivalent to the ratio of lifetimes. A postscript version is available through World-Wide-Web in http://w4.lns.cornell.edu/public/CLNS/1994

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