论文标题
观察半恒河衰减$ d^+\ toωμ^+ν_μ$
Observation of the semi-muonic decay $D^+\to ωμ^+ν_μ$
论文作者
论文摘要
我们使用$ e^+e^ - $ e^+e^ - $ collision数据样本对半持续衰减的首次观察$ d^+\至ωμ^+ν_μ$，与$ 2.93〜 \ mathrm {fb}^{ - 1} $相关的集成发光度相对应，并在中心的besiiiiiii detector collectecter centeral-of-mass of-mass Energy collectecter collectection。 $ d^+\至ωμ^+ν_μ$衰减的绝对分支分数被测量为$ {\ Mathcal B} _ {d^+\ toωμ^+ν_μ} =（17.7 \ pm1.8 _ {\ rm Stat} \ rm Stat} \ pm1.1.1.1.1.1.1.1.1.1.1.1.1.1. 10^{ - 4} $。它的比率与$ d^+\与ωe^+ν_e$ decay的分支分支的世界平均值，并确定为$ {\ Mathcal b} _ {d^+\ toωμ^+v+v+v+ν_μ}/{\ Mathcal B} ωe^+ν_e} = 1.05 \ pm0.14 $，与一个标准偏差内的标准模型期望一致。
We report the first observation of the semi-muonic decay $D^+\to ωμ^+ν_μ$ using an $e^+e^-$ collision data sample corresponding to an integrated luminosity of $2.93~\mathrm{fb}^{-1}$ collected with the BESIII detector at a center-of-mass energy of 3.773 GeV. The absolute branching fraction of the $D^+\to ωμ^+ν_μ$ decay is measured to be ${\mathcal B}_{D^+\to ωμ^+ν_μ}=(17.7\pm1.8_{\rm stat}\pm1.1_{\rm syst})\times 10^{-4}$. Its ratio with the world average value of the branching fraction of the $D^+\to ωe^+ν_e$ decay probes lepton flavor universality and it is determined to be ${\mathcal B}_{D^+\to ωμ^+ν_μ}/{\mathcal B}^{\rm PDG}_{D^+\to ωe^+ν_e}=1.05\pm0.14$, in agreement with the standard model expectation within one standard deviation.
