The study of the Cabibbo-favored semileptonic decay ${\mathrm{\Lambda }}_c^{+}\to \mathrm{\Lambda }{e}^{+}{\nu }_e$ is reported using a $4.5{\mathrm{fb}}^{-1}$ data sample of $e^{+}{e}^{-}$ annihilations collected at center-of-mass energies ranging from 4.600 GeV to 4.699 GeV with the BESIII detector at the BEPCII collider. The branching fraction of the decay is measured to be $\mathcal{B}({\mathrm{\Lambda }}_c^{+}\to \mathrm{\Lambda }{e}^{+}{\nu }_e)=(3.56\pm 0.11_{\mathrm{stat}}\pm 0.07_{\mathrm{syst}})\%$, which is the most precise measurement to date. Furthermore, we perform an investigation of the internal dynamics in ${\mathrm{\Lambda }}_c^{+}\to \mathrm{\Lambda }{e}^{+}{\nu }_e$. We provide the first direct comparisons of the differential decay rate and form factors with those predicted from lattice quantum chromodynamics (LQCD) calculations. Combining the measured branching fraction with a $q^2$-integrated rate predicted by LQCD, we determine $|V_{cs}|=0.936\pm 0.017_{\mathcal{B}}\pm 0.024_{\mathrm{LQCD}}\pm 0.007_{{\tau }_{{\mathrm{\Lambda }}_c}}$.

中文翻译：

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半轻子衰变Λc+→Λe+νe的研究

卡比博偏爱的半轻子衰变的研究${\mathrm{\Lambda }}_C^{+}\to \mathrm{\Lambda }{\mathrm{电子}}^{+}{\nu }_{\mathrm{电子}}$报告使用$4.5{\mathrm{面子书}}^{-\mathrm{1个}}$的数据样本${\mathrm{电子}}^{+}{\mathrm{电子}}^{-}$在 BEPCII 对撞机上使用 BESIII 探测器在 4.600 GeV 到 4.699 GeV 的质心能量范围内收集到湮灭。衰减的分支分数被测量为$\mathcal{乙}({\mathrm{\Lambda }}_C^{+}\to \mathrm{\Lambda }{\mathrm{电子}}^{+}{\nu }_{\mathrm{电子}})=(3.56\pm 0.1{\mathrm{1个}}_{\mathrm{状态}}\pm 0.07_{\mathrm{系统}})\%$，这是迄今为止最精确的测量。此外，我们对内部动态进行了调查${\mathrm{\Lambda }}_C^{+}\to \mathrm{\Lambda }{\mathrm{电子}}^{+}{\nu }_{\mathrm{电子}}$. 我们提供了微分衰减率和形状因子与晶格量子色动力学 (LQCD) 计算预测的首次直接比较。将测得的分支分数与$q^{\mathrm{2个}}$-LQCD 预测的综合率，我们确定$|V_{C秒}|=0.936\pm 0.017_{\mathcal{乙}}\pm 0.02{\mathrm{4个}}_{\mathrm{液晶量子CD}}\pm 0.007_{{\tau }_{{\mathrm{\Lambda }}_C}}$.