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We have searched for flavor-changing neutral-current weak decays of the b quark and find RB(b→l⁺l^-X)<0.31% at 90% confidence level. This limit excludes models with the b quark in a left-handed isosinglet. We also place limits on the ratio of the B^± and B⁰ semileptonic branching fractions and on B⁰-B⁰ mixing.
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Avery et al. (1984) studied this question.
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