Measurement of the Relative Branching Fraction of ${\rm Y}(4S)$ to Charged and Neutral B-Meson Pairs

Abstract

We analyze 9.7 x 10^6 B\bar{B}$ pairs recorded with the CLEO detector to determine the production ratio of charged to neutral B-meson pairs produced at the Y(4S) resonance. We measure the rates for B^0 -> J/psi K^{(*)0} and B^+ -> J/psi K^{(*)+} decays and use the world-average B-meson lifetime ratio to extract the relative widths f+-/f00 = Gamma(Y(4S) -> B+B-)/Gamma(Y(4S) -> B0\bar{B0}) = = 1.04 +/- 0.07(stat) +/- 0.04(syst). With the assumption that f+- + f00 = 1, we obtain f00 = 0.49 +/- 0.02(stat) +/- 0.01(syst) and f+- = 0.51 +/- 0.02(stat) +/- 0.01(syst). This production ratio and its uncertainty apply to all exclusive B-meson branching fractions measured at the Y(4S) resonance.

11 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS

References in corpus (3)

• Measurement of the B -> D^* l nu Branching Fractions and |Vcb|
• Measurement of the Decay Amplitudes and Branching Fractions of $B\to J/\psi K^{\ast }$ and $B\to J/\psi K$ Decays
• General analysis of B decays to two pseudoscalars for EWP, rescattering and color suppression effects

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