论文标题
在动态方法中的半衰减衰减为$λ_c^+$
Semileptonic decays of $Λ_c^+$ in dynamical approaches
论文作者
论文摘要
我们在两种相对论的动力学方法中研究了$λ_c^+ \ toλ（n）\ ell^+ g+ g+ \^+ \的半衰减。通过考虑夸克之间的费米统计数据，并在两个不同的动力学模型中确定重子中的自旋味结构以及螺旋形式形式，我们计算了分支比（$ {\ cal b} $），并在衰老中计算平均的不对称参数（$α$ s）。明确地发现，$ {\ cal b}（λ_c^+ \toλe^+ v+ v+ν_{e}）=（3.36 \ pm0.87,3.48）\％$和$ a $ and $ a $ and $α（λ_c^+ \toλee^+λe^+ν_{e}） （LFCQM，MBM），与$ {\ cal b}（λ_c^+ \toλe^+λe^+ v+ v+ v+ v+ν_{e}）=（3.6 \ pm0.4）\％$和$ a和$ al（λ_c^+ c^+ \toλee^+λe^+ν_{我们还预测$ {\ cal b}（λ_c^+ \ to n e^+ v+ν_{e}）=（0.57 \ pm0.15，3.6 \ pm1.5）\ times 10^{ - 3} $ ν_{e}）=（ - 0.98 \ pM0.02，-0.96 \ pm0.04）$ in LFCQM中的$，有两个不同的方案，用于中子中夸克的动量分布，$ {\ cal b}（\ cal b} $α（λ_c^+ \ to n e^+ν_{e}）= -0.87 $在MBM中，可以通过BESIII，LHCB和BELLEII的正在进行的实验对此进行测试。
We study the semileptonic decays of $Λ_c^+ \to Λ(n)\ell^+ ν_{\ell}$ in two relativistic dynamical approaches of the light-front constituent quark model (LFCQM) and MIT bag model (MBM). By considering the Fermi statistic between quarks and determining spin-flavor structures in baryons along with the helicity formalism in the two different dynamical models, we calculate the branching ratios (${\cal B}$s) and averaged asymmetry parameters ($α$s) in the decays. Explicitly, we find that ${\cal B}( Λ_c^+ \to Λe^+ ν_{e})=(3.36\pm0.87,3.48)\%$ and $α( Λ_c^+ \to Λe^+ ν_{e})=(-0.97\pm0.03,-0.83)$ in (LFCQM, MBM), in comparison with the data of ${\cal B}( Λ_c^+ \to Λe^+ ν_{e})=(3.6\pm0.4)\%$ and $α( Λ_c^+ \to Λe^+ ν_{e})=-0.86\pm 0.04$ given by the Particle Data Group, respectively. We also predict that ${\cal B}( Λ_c^+ \to n e^+ ν_{e})=(0.57\pm0.15, 3.6\pm1.5)\times 10^{-3}$ and $α( Λ_c^+ \to n e^+ ν_{e})=(-0.98\pm0.02,-0.96\pm0.04)$ in LFCQM with two different scenarios for the momentum distributions of quarks in the neutron, and ${\cal B}( Λ_c^+ \to n e^+ ν_{e})= 0.279\times 10^{-2}$ and $α( Λ_c^+ \to n e^+ ν_{e})=-0.87$ in MBM, which could be tested by the ongoing experiments at BESIII, LHCb and BELLEII.
