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Lifetime of the hypertriton

机译:高文顿的寿命

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We calculate the lifetime of the hypertriton as a function of the Lambda separation energy B-Lambda in an effective field theory with Lambda and deuteron degrees of freedom. We also consider the impact of new measurements of the weak decay parameter of the Lambda. While the sensitivity of the total width to B-Lambda is small, the partial widths for decays into individual final states and the experimentally measured ratio R = Gamma(3He) / Gamma(3He) + Gamma(pd)) show a strong dependence. For the standard value B-Lambda = (0.13 +/- 0.05) MeV, we find R = 0.37 +/- 0.05, which is in good agreement with past experimental studies and theoretical calculations. For the recent STAR value B-Lambda = (0.41 +/- 0.12 +/- 0.11) MeV, we obtain R = 0.57 +/- 0.11.
机译:在有效场理论中,我们用Lambda自由度和氘自由度计算了超轻子的寿命,作为Lambda分离能B-Lambda的函数。我们还考虑了新测量的弱衰减参数λ的影响。虽然总宽度对B-Lambda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值R=γ(3He)/γ(3He)+γ(pd))表现出强烈的依赖性。对于标准值B-Lambda=(0.13+/-0.05)MeV,我们发现R=0.37+/-0.05,这与过去的实验研究和理论计算非常一致。对于最近的星值B-Lambda=(0.41+/-0.12+/-0.11)MeV,我们得到R=0.57+/-0.11。

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