Improved measurement of $ψ(2S)$ decays into $τ^{+}τ^{-}$

Details Improved measurement of $ψ(2S)$ decays into $τ^{+}τ^{-}$ Improved measurement of $ψ(2S)$ decays into $τ^{+}τ^{-}$

2006-09-13

arxiv.org/abs/hep-ex/0609023v1

Physics

High Energy Physics

High Energy Physics - Experiment

12 pages, 1 figure

Scientific paper

Using 14M $\psi (2S)$ events collected at BESII, the branching fraction of
$\psi (2S)\to \tau ^{+}\tau ^{-}$ is measured to be $Br_{\tau \tau}=(3.10\pm
0.21\pm 0.38)\times 10^{-3}$, where the first error is statistical and the
second is systematic.

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