论文标题
$ k^{+} \toπ^{+}μ^{+}μ^{ - } $ decay的测量值
A measurement of the $K^{+} \to π^{+} μ^{+} μ^{-}$ decay
论文作者
论文摘要
$ 2.8 \ times 10^4 $ $ K^{+} \ toπ^{+}μ^{+}μ^{ - } $候选背景可忽略不计的样本。独立于模型的分支分数的测量为$（9.15 \ pm 0.08）\ times 10^{ - 8} $，比以前的测量值更精确。衰减外形是作为平方dimuon质量的函数表示的。使用基于手性扰动理论的描述在$ \ Mathcal {o}（p^6）$上进行了对形式因子参数及其不确定性的测量。
A sample of $2.8 \times 10^4$ $K^{+} \to π^{+} μ^{+} μ^{-}$ candidates with negligible background was collected by the NA62 experiment at the CERN SPS in 2017--2018. The model-independent branching fraction is measured to be $(9.15 \pm 0.08)\times 10^{-8}$, a factor three more precise than previous measurements. The decay form factor is presented as a function of the squared dimuon mass. A measurement of the form factor parameters and their uncertainties is performed using a description based on Chiral Perturbation Theory at $\mathcal{O}(p^6)$.
