论文标题
与$ξ_c-ξ_c'$混合的双重迷人重子的半衰减
Semileptonic decays of doubly charmed baryons with $Ξ_c-Ξ_c'$ mixing
论文作者
论文摘要
我们研究了$ξ_c-ξ_c'$混合效果，在半蛋白质衰减中损失了$ξ_{cc} $的双重魅力baryons。我们专注于$ {\ cal r}（θ_c）\ equiv {\ cal b}（ξ_{cc} \ toξ_c'c'ee^+ n e^+ν_e）/ {\ cal b}（ξ_ r}（θ_0），{\ cal r}（ - θ_0））=（0.46 \ pm 0.01,7.33 \ pm 0.23）$，$θ_0=0.137π$，与$ {\ cal r}（0）（0）= 2.15 \ pm0.11 $相对鲜明对比。对于负〜（正）$θ_C$，该比率提高了〜（抑制）四倍。此外，发现$ξ_c^{（\ prime）} $的极化不对称为$α（-θ_0）= 0.32〜（-0.76）$和$α（θ_0）= -0.82〜（-0.38）$。由于$ {\ cal r} $和$α$对$θ_c$高度敏感，并且不受$ w $ -exchange贡献的影响，因此它们为正在进行的实验中确定$θ_c$提供了绝佳的机会。
We study the $Ξ_c- Ξ_c'$ mixing effects in the semileptonic decays the doubly charm baryons of $Ξ_{cc}$. We focus on the ratio of ${\cal R}(θ_c) \equiv {\cal B}( Ξ_{cc} \to Ξ_c' e^+ ν_e)/ {\cal B}( Ξ_{cc} \to Ξ_c e^+ ν_e) $ and find that $({\cal R}(θ_0),{\cal R}(- θ_0)) =(0.46 \pm 0.01,7.33 \pm 0.23)$ with $θ_0 = 0.137π$, which are in sharp contrast to ${\cal R}(0)=2.15\pm0.11$ without the mixing. The ratio is enhanced~(suppressed) by a factor of four for a negative~(positive) $θ_c$. In addition, the polarization asymmetries of $Ξ_c^{(\prime)}$ are found to be $α(-θ_0) = 0.32 ~(-0.76)$ and $α(θ_0) = -0.82~(-0.38)$. As ${\cal R}$ and $α$ are highly sensitive to $θ_c$ and unaffected by the $W$-exchange contributions, they provide excellent opportunities to determine $θ_c$ in the ongoing experiments.
