AI 中文总结
研究强激光场中类轴子粒子衰变成电子 - 正电子对的自旋分辨衰变，用Baier - Katkov形式和局部恒定场近似推导解析速率，揭示有限质量、阈值效应与自旋分辨光谱、纠缠的关系，为强场ALP搜索提供特征标识。
AI 中文摘要
我们研究了强激光场中类轴子粒子（ALP）衰变成电子 - 正电子对的自旋分辨衰变。使用Baier - Katkov准经典算符形式和局部恒定场近似，我们推导出一个紧凑的解析速率，保留了有限ALP质量效应和轻子自旋自由度。在无质量极限下，自旋求和速率与相应的光子诱导对产生速率具有相同的弱场和强场渐近标度，而赝标量耦合会诱导不同的自旋分辨通道和自旋相关性。有限的ALP质量会重新组织跨越真空阈值的光谱，在阈值以下产生纯场诱导的对产生，在阈值以上通过真空和场辅助贡献的相干相互作用产生自旋相关的振荡调制。产生的对的纠缠反映了主导的产生机制。在弱场中的真空阈值附近，对几乎是最大纠缠且类似单重态。远离阈值时，约化自旋态变为类似三重态，当强场产生占主导时保持1/2的并发度，但当真空衰变占主导时变为可分离的。这些结果确定了自旋分辨光谱和纠缠是强场ALP搜索中有限质量和阈值效应的特征。
英文摘要
We investigate spin-resolved decay of an axion-like particle (ALP) into an electron--positron pair in an intense laser field. Using the Baier--Katkov quasiclassical operator formalism and the locally constant field approximation, we derive a compact analytic rate retaining finite ALP-mass effects and the lepton spin degrees of freedom. In the massless limit, the spin-summed rate has the same weak- and strong-field asymptotic scalings as the corresponding photon-induced pair-creation rate, while the pseudoscalar coupling induces distinct spin-resolved channels and spin correlations. A finite ALP mass reorganizes the spectrum across the vacuum threshold, producing purely field-induced pair creation below threshold and spin-dependent oscillatory modulations above threshold through the coherent interplay of vacuum and field-assisted contributions. The entanglement of the produced pair reflects the dominant production mechanism. Near the vacuum threshold in weak fields, the pair is nearly maximally entangled and singlet-like. Away from threshold, the reduced spin state becomes triplet-like, retaining a concurrence of \(1/2\) when strong-field production dominates but becoming separable when vacuum decay dominates. These results identify spin-resolved spectra and entanglement as signatures of finite-mass and threshold effects in strong-field ALP searches.
Comments18 pages, 7 figures
