AI 中文总结
以Z玻色子辐射衰变为例，在完整三体相空间对τ⁻τ⁺γ自旋态进行详细分析，通过量子信息可观测量量化τ⁻τ⁺自旋态随光子辐射的变化，发现光子对费米子对可能致退相干或增强纠缠。
AI 中文摘要
对撞机过程中的末态辐射可被解释为与未观测自由度的相互作用，常于纠缠态退相干背景下讨论。我们将Z玻色子的辐射衰变视为典型例子，对由标准模型的手征相互作用决定的τ⁻τ⁺γ自旋态在完整三体相空间进行详细分析研究。探索各种量子信息可观测量以量化τ⁻τ⁺自旋态如何随光子辐射变化。发现一些显著特征，如发射的光子对费米子对既可能导致退相干，也可能使纠缠单调增强。
英文摘要
Final state radiation in collider processes can be interpreted as interactions with unobserved degrees of freedom and is often discussed within the context of decoherence of an entangled state. We consider the radiative decay of the $Z$ boson as a representative example and perform a detailed analytical study of the $τ^-τ^+γ$ spin state, as determined by the chiral interactions of the Standard Model, over the complete three-body phase space. We explore various quantum information observables to quantify how the $τ^-τ^+$ spin state changes with the photon radiation. We find some striking features, for example that the emitted photon could either lead to decoherence or monotonic enhancement of entanglement for the fermion pair.
