Improved measurement of ψ(2S) decays into τ+τ-

PHYSICAL REVIEW D(2006)

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摘要
Using 14M psi(2S) events collected at BESII, the branching fraction of psi(2S)->tau(+)tau(-) is measured to be Br-tau tau=(3.08 +/- 0.21 +/- 0.38)x10(-3), where the first error is statistical and the second is systematic.
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