Measurement of the Absolute Branching Fraction of D-s(+) -> tau(+)nu(tau) via tau(+) -> e(+)nu(e)(nu)over-bar(tau)
Measurement of the Absolute Branching Fraction of D-s(+) -> tau(+)nu(tau) via tau(+) -> e(+)nu(e)(nu)over-bar(tau)
复制标题
通过 tau( ) -> e( )nu(e)(nu)over-bar(tau) 测量 D-s( ) -> tau( )nu(tau) 的绝对分支分数
DOI：
10.1103/physrevlett.127.171801
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发表时间：
2021
影响因子：
8.6
通讯作者：
Briere R.
中科院分区：
文献类型：
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作者：
Ablikim M.;Achasov M. N.;Adlarson P.;Ahmed S.;Albrecht M.;Aliberti R.;Amoroso A.;An M. R.;An Q.;Bai X. H.;Bai Y.;Bakina O.;Ferroli R. Baldini;Balossino I;Ban Y.;Begzsuren K.;Berger N.;Bertani M.;Bettoni D.;Bianchi F.;Bloms J.;Bortone A.;Boyko I;Briere R.
使用 BESIII 探测器在 4178 至 4226 MeV 质心能量处收集的湮灭数据数据集，我们测量了轻子衰变的绝对分支分数，并发现其中第一个不确定性是统计性的，第二个不确定性是系统性的。与之前的最佳测量结果相比，精度提高了 2 倍。结合晶格量子色动力学计算或CKMfitter组，我们分别提取 和 。将我们的结果与 和 的世界平均值相结合，我们得到了支化分数的比率，这与轻子风味普遍性的标准模型预测一致。
Using a dataset ofofannihilation data collected with the BESIII detector at center-of-mass energies between 4178 and 4226 MeV, we have measured the absolute branching fraction of the leptonic decayvia, and find, where the first uncertainty is statistical and the second is systematic. The precision is improved by a factor of 2 compared to the previous best measurement. Combining withfrom lattice quantum chromodynamics calculations or thefrom the CKMfitter group, we extractand, respectively. Combining our result with the world averages ofand, we obtain the ratio of the branching fractions, which is consistent with the standard model prediction of lepton flavor universality.