标题： 轻弦态的寿命 显示英文标题

标题： Lifetimes of light stringy states

摘要： 本文中，我们评估了标准模型在相交D-膜实现中出现的轻弦态的寿命。为具体起见，我们集中于一个衰变为两个无质量费米子的轻质量标量粒子的研究。根据当前实验给出的弦尺度的下限，我们将寿命作为相交角度的函数外推到非常小的角度，以便得到宇宙尺度上寿命的态。这提供了一个诱人的例子：一个具有超长寿命的大质量且弱相互作用场，将其作为一个潜在的暗物质候选者提出来。 显示英文摘要

摘要： In this paper, we evaluate the lifetime of the light stringy states that emerge in intersecting D-brane realisations of the Standard Model. For concreteness, we focus on a light massive scalar decaying into two massless fermions. Given the present experimental lower bounds of the string scale, we extrapolate the lifetime as a function of the intersection angles to very small angles in order to have states with lifetimes of the order of the universe. That provides an alluring example of a massive, very weakly interacting field with a huge lifetime, proposing itself as a potential dark matter candidate.