论文标题
寿命
Lifetime of the hypertriton
论文作者
论文摘要
我们将Hypertriton的寿命计算为$λ$分离能量$b_λ$在有效的场理论中，并具有$λ$和杜特隆自由度。我们还考虑了$λ$的弱衰减参数的新测量结果。虽然总宽度至$b_λ$的敏感性很小，但局部宽度衰减到单个最终状态和实验测量的比率$ r =γ_ {^3 \ textrm {he}}/\ left（γ_{γ_{^3 \ text {he}}}}}}+γ_{pd} $ wheet（对于标准值$b_λ=（0.13 \ pm 0.05）$ MEV，我们发现$ r = 0.37 \ pm 0.05 $，这与过去的实验研究和理论计算非常吻合。对于最近的恒星值$b_λ=（0.41 \ pm0.12 \ pm0.11）$ mev，我们获得$ r = 0.57 \ pm 0.11 $。
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 $R=0.57\pm 0.11$.
