论文标题
$λ_C^+$半衰减的解剖结构
Anatomy of $Λ_c^+$ semileptonic decays
论文作者
论文摘要
我们提出了一项系统的研究，对$λ_c^+ \ to {\ cal b} _q \ ell^+ el^+ en^+ en \ ell $，$ {\ cal b} _q =（λ，n）$和$ \ ell =（e，u，μ）$，检查了所有可能的decay obsay obserables，检查了所有可能的decay obserablebs，它基于同型袋（HBM）和latte（hbm QC）（late）。使用HBM，我们发现女儿BARYON $λ$的分支分数和两极分化是$ {\ cal b}（λ_c^+ \toλe^+λe^+ν_e，λμ^+ν_+ν_μ，n \ ell^+ ell^+ ell^+ el^+ en ）\％$和$α_λ（λ_c^+ \toλe^+ν_e，λμ^+ν_μ）=（ - 82.6，-82.3）\％$。从LQCD中，我们获得$α_λ（λ_c^+ \toλe^+ν_e，μ^+ν_μ）=（-87.4 \ pm 1.0，-87.2 \ pm 1.0）\％$。我们还探索了由于标准模型以外的新物理学而引起的时间反转不对称。我们所有的结果都与当前的实验数据一致，而在Besiii和Belle II的实验可以访问其中的一些结果。
We present a systematic study of $Λ_c^+ \to {\cal B}_q \ell^+ ν_\ell $ with ${\cal B}_q = (Λ, n)$ and $\ell =( e, μ)$, examining all the possible decay observables based on the homogeneous bag model (HBM) and lattice QCD (LQCD). With the HBM, we find that the branching fractions and polarization asymmetries of the daughter baryon $Λ$ are ${\cal B}(Λ_c^+ \to Λe^+ ν_e, Λμ^+ ν_μ, n \ell ^+ ν_\ell ) = (3.78 \pm 0.25, 3.67\pm 0.23, 0.40\pm 0.04 )\%$ and $α_Λ(Λ_c^+ \to Λe^+ ν_e,Λμ^+ ν_μ) =(-82.6,-82.3)\%$, respectively. From the LQCD, we obtain that $α_Λ(Λ_c^+ \to Λe^+ ν_e, μ^+ ν_μ) = (-87.4\pm 1.0,-87.2\pm 1.0)\%$. We also explore the time-reversal asymmetries due to new physics beyond the standard model. All our results are consistent with the current experimental data, while some of them are accessible to the experiments at BESIII and Belle II.
