Measurement of the branching fraction of leptonic decay D-s(+) -> tau(+)nu(tau) via tau(+) -> pi(+)pi(0)(tau)
Measurement of the branching fraction of leptonic decay D-s(+) -> tau(+)nu(tau) via tau(+) -> pi(+)pi(0)(tau)
复制标题
通过 tau( ) -> pi( )pi(0)(tau) 测量轻子衰变的分支分数 D-s( ) -> tau( )nu(tau)
DOI：
10.1103/physrevd.104.032001
复制
发表时间：
2021
影响因子：
5
通讯作者：
Briere R.
中科院分区：
文献类型：
--
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.
通过分析BESIII探测器在4.178 ~ 4.226 GeV质心处收集的湮灭数据，我们确定了轻子衰变的分支分数，为BDs+→τ+ντ=(5.29±0.25stat±0.20syst)%。我们估计Cabibbo-Kobayashi-Maskawa矩阵元素和衰变常数的乘积为fDs+|Vcs|=(244.8±5.8stat±4.8syst) MeV，使用已知的质量和寿命值，以及我们的分支分数测量。结合标准模型的全局拟合和晶格量子色动力学得到的值，得到和。利用的分支分数，我们得到了分支分数的比值，这与轻子风味普适性的标准模型预测一致。
By analyzingofannihilation data collected at the center-of-mass energies between 4.178 and 4.226 GeV with the BESIII detector, we determine the branching fraction of the leptonic decay, with, to be BDs+→τ+ντ=(5.29±0.25stat±0.20syst)%. We estimate the product of the Cabibbo-Kobayashi-Maskawa matrix elementand thedecay constantto be fDs+|Vcs|=(244.8±5.8stat±4.8syst) MeV, using the known values of theandmasses as well as thelifetime, together with our branching fraction measurement. Combining the value ofobtained from a global fit in the standard model andfrom lattice quantum chromodynamics, we obtainand. Using the branching fraction of, we obtain the ratio of the branching fractions, which is consistent with the standard model prediction of lepton flavor universality.