Study of the B^0 Semileptonic Decay Spectrum at the Upsilon(4S) Resonance

Details Study of the B^0 Semileptonic Decay Spectrum at the Upsilon(4S) Resonance Study of the B^0 Semileptonic Decay Spectrum at the Upsilon(4S) Resonance

1997-02-13

arxiv.org/abs/hep-ex/9702007v1

Phys.Lett.B399:321-328,1997

Physics

High Energy Physics

High Energy Physics - Experiment

14 page, postscript file also available at http://w4.lns.cornell.edu/public/CLNS

Scientific paper

10.1016/S0370-2693(97)00336-5

We have made a first measurement of the lepton momentum spectrum in a sample of events enriched in neutral B's through a partial reconstruction of B0 --> D*- l+ nu. This spectrum, measured with 2.38 fb**-1 of data collected at the Upsilon(4S) resonance by the CLEO II detector, is compared directly to the inclusive lepton spectrum from all Upsilon(4S) events in the same data set. These two spectra are consistent with having the same shape above 1.5 GeV/c. From the two spectra and two other CLEO measurements, we obtain the B0 and B+ semileptonic branching fractions, b0 and b+, their ratio, and the production ratio f+-/f00 of B+ and B0 pairs at the Upsilon(4S). We report b+/b0=0.950 (+0.117-0.080) +- 0.091, b0 = (10.78 +- 0.60 +- 0.69)%, and b+ = (10.25 +- 0.57 +- 0.65)%. b+/b0 is equivalent to the ratio of charged to neutral B lifetimes, tau+/tau0.

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