Decay of the vortex muon
Decay of the vortex muon
复制标题
涡旋μ子的衰变
DOI：
10.1103/physrevd.104.036003
复制
发表时间：
2021
影响因子：
5
通讯作者：
Pengming Zhang
中科院分区：
文献类型：
--
作者：
Peng;Igor P. Ivanov;Pengming Zhang
Muon衰变是自我分析的：发射的电子的谱角分布揭示了极化的Muon的自旋方向。在这里，我们展示了同样的特征适用于非平面波态的介子，并帮助揭示了丰富的极化机会。我们主要研究所谓的涡旋态，在这种涡旋态中，Muon相对于平均传播方向携带非零的轨道角动量，并且在动量分布上呈现锥形结构。我们计算了涡旋µ子衰变过程中发射的电子的能谱和角分布，结果表明，最有启发性的不是角分布，而是定角电子能谱。即使对于非常小的涡旋µ子的锥体张开角，也很容易观察到电子光谱的显著变化，这将使人们能够区分涡旋µ子和近似的平面波µ子，以及区分不同的极化状态。这些特征将是追踪涡旋µ子在外部磁场中演化的关键。
Muon decay is self-analyzing: the spectral-angular distribution of the emitted electron reveals the spin orientation of the polarized muon. Here, we show that the same feature applies to muons in non-plane-wave states and helps reveal the rich polarization opportunities available. We focus on the so-called vortex states, in which the muon carries a non-zero orbital angular momentum with respect to the average propagation direction and exhibits a cone structure in the momentum distribution. We compute the spectrum and the angular distribution of the electrons emitted in decays of vortex muons and show that the most revealing observable is not the angular distribution but the fixed-angle electron spectra. Even for very small cone opening angles of the vortex muons, it will be easy to observe significant modifications of the electron spectra which would allow one to distinguish vortex muons from approximately plane wave muons, as well as to differentiate among various polarization states. These features will be the key to tracking the evolution of vortex muons in external magnetic fields.