论文标题
部分可观测时空混沌系统的无模型预测
$a \to πππ$ decay at next-to-leading order in chiral perturbation theory
论文作者
论文摘要
我们讨论了手性扰动理论的临近领先顺序（NLO）的两流轴轴 - 抗原有效拉格朗日的构建，并作为一种现象学应用，是通过通道$ a \ toπππ$ a \ a \ a \ a \ a轴的衰减速率的计算。通过NLO计算，我们评估了有效场理论的有效性范围，并表明手性膨胀在运动阈值之上。为了扩展轴突 - 铅相互作用的手性描述，要求采用替代性非扰动方法。
We discuss the construction of the two-flavour axion-pion effective Lagrangian at the next-to-leading order (NLO) in chiral perturbation theory and present, as a phenomenological application, the calculation of the decay rate of a GeV-scale axion-like particle via the channel $a \to πππ$. Through the NLO calculation, we assess the range of validity of the effective field theory and show that the chiral expansion breaks down just above the kinematic threshold. Alternative non-perturbative approaches are called for in order to extend the chiral description of axion-pion interactions.
