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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Feldmanetal,Phys.Lett.,33C（1977）285;Hilgeretal,Phys.Rev.Lett.,35（1975）625.[2]丁慧良等，高能物理与核物理，16（1992）769;J.Z.Baietal.,Phys.Rev.Lett,69（1992）3021;J.Z.Baietal,Nucl.Instr.Method,A344（1994）319-334.[3]许榕生等，高能物理与核物理，15（1991）447.[4]吴济民，赵培英，高能物理与核物理，17（1993）379;吴济民，在（3686）共振态附近e+e-→τ+τ的截面行为，BES合作组杭州年会报告，1994年7月。[5]崔象宗，数据的大角度亮度，BES内部报告，1994年4月。[6]苑长征，由（2S）→π+π-J/衰变测量J/轻子道衰变分支比，中国科学院高能所，硕土论文。1994年。[7]ParticleDataGroup,LowellS.Brown et.al,Phys.Rev,D50,3（1994）.

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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.