Tau decays into three charged leptons and two neutrinos.

Tau decays into three charged leptons and two neutrinos.
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Tau 衰变成三个带电轻子和两个中微子。

DOI:
10.1103/physrevlett.76.2637
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发表时间:
1996
影响因子:
8.6
通讯作者:
He
He
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Alam;Kim;Ling;Mahmood;O’Neill;Severini;Sun;Timm;Wappler;Duboscq;Fulton;Fujino;Gan;Honscheid;Kagan;Kass;Lee;Sung;White;Wanke;Wolf;Zoeller;Fu;Nemati;Richichi;Ross;Skubic;Wood;Bishai;Fast;Gerndt;Hinson;Miao;Miller;Modesitt;Shibata;Shipsey;Wang;Gibbons;Johnson;Kwon;Roberts;Thorndike.;Jessop;Lingel;Marsiske;Perl;Schaffner;Coan;Dominick;Fadeyev;Korolkov;Lambrecht;Sanghera;Shelkov;Stroynowski;Volobouev;Wei;Artuso;Efimov;Gao;Goldberg;He

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我们利用在康奈尔电子储存环上的CLEO-Ⅱ实验收集的3.60fb^(-1)的数据,寻找τ→ee^+e^-ν_τν_e和τ→μe^+e^-ν_τν_μ的辐射轻子衰变。我们首次观测到τ→ee^+e^-ν_τν_e过程。对于这个通道,我们测量了分支分数B(τ→ee^+e^-ν_τν_e)=(2.7_(-1.1-0.4-0.3)^(+1.5+0.4+0.1))×10^(-5)。确定了第二通道的上限:B(τ→μe^+e^-ν_τν_μ)<3.2×10^(-5)(90% C. L)。这两个结果都与标准模型预测的速率一致。
We search for the radiative leptonic tau decays τ→ee^+e^-ν_τν_e and τ→μe^+e^-ν_τν_μ using 3.60fb^(-1) of data collected by the CLEO-II experiment at the Cornell Electron Storage Ring. We present a first observation of the τ→ee^+e^-ν_τν_e process. For this channel we measure the branching fraction B(τ→ee^+e^-ν_τν_e) = (2.7_(-1.1-0.4-0.3)^(+1.5+0.4+0.1))×10^(-5). An upper limit is established for the second channel: B(τ→μe^+e^-ν_τν_μ)<3.2×10^(-5) at 90% C.L. Both results are consistent with the rates expected from standard model predictions.