Hypertriton的寿命
Lifetime of the hypertriton
摘要：
我们计算了超夸克的寿命作为$Λ$分离能$B_Λ$的函数在有效场论与$Λ$和氘自由度。我们还考虑了新的测量的弱衰变参数的$Λ$的影响。虽然总宽度对$B_Λ$的灵敏度很小，但衰变到单个终态的部分宽度和实验测量的比率$R=Γ_{^3\textrm{He}}/\left(Γ_{^3 \text{He}}+Γ_{pd}\right)$显示出很强的依赖性。对于标准值$B_Λ=(0.13\pm 0.05)$ MeV，我们发现了$R=0.37\pm 0.05$，这与过去的实验研究和理论计算结果吻合得很好。对于最近的STAR值$B_Λ=(0.41\pm0.12\pm0.11)$ MeV，我们得到了$R=0.57\pm 0.11$。
英文摘要：
We calculate the lifetime of the hypertriton as function of the $Λ$ separation energy $B_Λ$ in an effective field theory with $Λ$ and deuteron degrees of freedom. We also consider the impact of new measurements of the weak decay parameter of the $Λ$. While the sensitivity of the total width to $B_Λ$ is small, the partial widths for decays into individual final states and the experimentally measured ratio $R=Γ_{^3\textrm{He}}/\left(Γ_{^3 \text{He}}+Γ_{pd}\right)$ show a strong dependence. For the standard value $B_Λ=(0.13\pm 0.05)$ MeV, we find $R=0.37\pm 0.05$, which is in good agreement with past experimental studies and theoretical calculations. For the recent STAR value $B_Λ=(0.41\pm0.12\pm0.11)$ MeV, we obtain $R=0.57\pm 0.11$.
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