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

BES Collaboration

Chinese Physics C> 1995, Vol. 19> Issue(7) : 577-584

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

BES Collaboration

Institute of High Energy Physics, Academia Sinica, Beijing 100039

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Abstract：
The decay ψ(2S) →τ^＋τ^－ has been studied by using the 1.27 million ψ(2S) events produced from the BES experiment at the BEPC collider. The τ^＋τ^－ 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.

References

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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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沈阳化工大学材料科学与工程学院沈阳 110142

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

BES Collaboration

Institute of High Energy Physics, Academia Sinica, Beijing 100039

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1995-07-05

Abstract: The decay ψ(2S) →τ^＋τ^－ has been studied by using the 1.27 million ψ(2S) events produced from the BES experiment at the BEPC collider. The τ^＋τ^－ 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.