正电子偶素(o-Ps)寿命困惑及其最终解决

The orthopositronium lifetime puzzle and its final solution

正电子偶素o -Ps是由电子和正电子组成的纯轻子束缚系统 ,o -Ps在真空中的寿命可由量子电动力学进行精确的理论计算 ,但长期以来理论值和实验测量值之间存在较大的偏差 ,为了解决这一问题 ,理论和实验物理学经过长期共同努力 ,最终于近年解决了o -Ps寿命困惑 .文章简要介绍了正电子偶素o -Ps寿命理论值和实验值之间不一致的历史状况和最近的实验技术的改进以及该问题的最终解决情况 。

The ortho-positronium (o-Ps), which consists of an electron and positron, is a pure lepton bound system. The o\|Ps lifetime can be calculated accurately by quantum electrodynamics, but there is a long\|standing discrepancy between the theoretical calculations and the experimental results. Theoretical and experimental physicists have worked hard for a long time to solve the problem, and recently finally solved this lifetime puzzle. We briefly outline the discrepancy between the theoretical calculations of the o\|Ps annihilation decay rate and some of the experimental measurements, as well as recent developments of experimental techniques, and its final solution. In particular, the final results of the Tokyo and Michigan groups are discussed.