Aubert, B. et al. (2004) Measurement of the B+/B0 production ratio from the Υ(4S) meson using B+→J/ψK+ and B0→J/ψKS0 decays. Physical Review D, 69 (7). 071101. ISSN 1550-7998

We report a measurement of the production ratio of charged and neutral B mesons from Υ(4S) decays based on the ratio of efficiency-corrected yields for the charmonium modes J/ψK+ and J/ψKs0 with 81.9 fb-1 of data collected with the BABAR detector on the Υ(4S) resonance at 10.580 GeV. We find a value of 1.006±0.036(stat)±0.031(syst) for the ratio R+/0=Γ(Υ(4S)→B+B-)/Γ(Υ(4S)→B0B0).

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