Measurement of relative branching fractions of B decays to ψ (2 S ) and J / ψ mesons
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The European Physical Journal C（2012）
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摘要
The relative rates of B -meson decays into J / ψ and ψ (2 S ) mesons are measured for the three decay modes in pp collisions recorded with the LHCb detector. The ratios of branching fractions ( ℬ ) are measured to be where the third uncertainty is from the ratio of the ψ (2 S ) and J / ψ branching fractions to μ + μ − .
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关键词
Transverse Momentum,Invariant Mass,Systematic Uncertainty,Invariant Mass Distribution,Primary Vertex
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