Measurement of the Michel parameter rho in muon decay.
Measurement of the Michel parameter rho in muon decay.
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DOI：
10.1103/physrevlett.94.101805
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发表时间：
1994-07
影响因子：
8.6
通讯作者：
J. Musser;R. Bayes;Y. Davydov;P. Depommier;J. Doornbos;W. Faszer;C. Gagliardi;A. Gaponenko;D. Gill;P. Green;P. Gumplinger;M. Hasinoff;R. Henderson;J. Hu;B. Jamieson;P. Kitching;D. Koetke;A. Krushinsky;Y. Lachin;J. Macdonald;R. P. Macdonald;G. Marshall;E. Mathie;L. V. Miasoedov;R. Mischke;P. Nord;K. Olchanski;A. Olin;R. Openshaw;T. Porcelli;J. Poutissou;R. Poutissou;M. Quraan;N. Rodning;V. Selivanov;G. Sheffer;B. Shin;F. Sobratee;T. Stanislaus;R. Tacik;V. Torokhov;R. Tribble;M. Vasiliev;D. Wright
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文献类型：
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作者：
J. Musser;R. Bayes;Y. Davydov;P. Depommier;J. Doornbos;W. Faszer;C. Gagliardi;A. Gaponenko;D. Gill;P. Green;P. Gumplinger;M. Hasinoff;R. Henderson;J. Hu;B. Jamieson;P. Kitching;D. Koetke;A. Krushinsky;Y. Lachin;J. Macdonald;R. P. Macdonald;G. Marshall;E. Mathie;L. V. Miasoedov;R. Mischke;P. Nord;K. Olchanski;A. Olin;R. Openshaw;T. Porcelli;J. Poutissou;R. Poutissou;M. Quraan;N. Rodning;V. Selivanov;G. Sheffer;B. Shin;F. Sobratee;T. Stanislaus;R. Tacik;V. Torokhov;R. Tribble;M. Vasiliev;D. Wright
TWIST合作测量了正常介子衰变中的米歇尔参数Rho，u(+)-->；e(+)nu(E)nu(U)。在标准模型中，Rho=3/4。偏离这个值意味着左右手介子和电子耦合的混合。我们得到Rho=0.750 80+/-0.000 32(STAT)+/-0.000 97(SYST)+/-0.000 23，其中最后一个不确定度表示RHO对米歇尔参数Eta的依赖。这一结果对左右对称模型中的W(L)-W(R)混合角设定了新的限制。
The TWIST Collaboration has measured the Michel parameter rho in normal muon decay, mu(+)--> e(+)nu(e)nu (mu). In the standard model, rho = 3/4. Deviations from this value imply mixing of left- and right-handed muon and electron couplings. We find rho=0.750 80+/-0.000 32(stat) +/- 0.000 97(syst) +/- 0.000 23, where the last uncertainty represents the dependence of rho on the Michel parameter eta. This result sets new limits on the W(L)-W(R) mixing angle in left-right symmetric models.