Study of ψ(2S) Decay to τ Lepton Pairs

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BES Collaboration. Study of ψ(2S) Decay to τ Lepton Pairs[J]. Chinese Physics C, 1995, 19(7): 577-584.
BES Collaboration. Study of ψ(2S) Decay to τ Lepton Pairs[J]. Chinese Physics C, 1995, 19(7): 577-584. shu
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Received: 1900-01-01
Revised: 1900-01-01
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Study of ψ(2S) Decay to τ Lepton Pairs

  • Institute of High Energy Physics, Academia Sinica, Beijing 100039

Abstract: The decay ψ(2S) →ττ has been studied by using the 1.27 million ψ(2S) events produced from the BES experiment at the BEPC collider. The ττ decay branching ratio is for the first time measured to be (3.54±0.61±0.63)×10-3, which is consistent with the prediction of the hypothesis of e-μ-τ universality. Combiningthis value with the previous leptonic data of ψ(2S), the total width of the ψ(2S) is found to be 251±37keV.

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