标题： 通过量子断层扫描的$τ$二极管干扰恢复 显示英文标题

标题： Interference Resurrection of the $τ$ Dipole through Quantum Tomography

摘要： 螺旋度选择规则可以抑制标准模型有效场理论（SMEFT）中维度6算符的主导贡献，从而降低对潜在新物理的敏感度。 本文探讨了在不同可观测量中，$\tau$轻子的异常磁矩的干涉贡献是如何恢复的，特别是比较了量子信息可观测量和更传统的自旋关联对SMEFT算符的敏感度。 我们使用蒙特卡罗模拟计算了各种可观测量——包括纠缠度量、贝尔不等式违反和量子不确定性——对新物理效应的敏感度。 发现自旋关联可观测量在对$CP$保持和破坏效应的敏感度方面优于积分截面和量子信息可观测量，将对新物理尺度的敏感度提高了多达3倍。 我们的结果表明，量子信息可观测量是恢复干涉的次优探针，更一般地说，对于解开$CP$的新物理特性也是如此。 显示英文摘要

摘要： Helicity selection rules can suppress the leading contributions from dimension-6 operators in the Standard Model Effective Field Theory (SMEFT), reducing sensitivity to potential new physics. This paper explores how the interference contributions from the $\tau$ lepton's anomalous dipole moment are restored in different observable, in particular comparing the sensitivity to SMEFT operators of quantum information observables and more traditional spin correlations. We compute the sensitivity of various observables-including entanglement measures, Bell inequality violations, and quantum uncertainties-to new physics effects using Monte Carlo simulations. Spin correlation observables are found to outperform both the integrated cross-section and quantum information observables in sensitivity to both $CP$-conserving and -violating effects, improving the sensitivity to the scale of new physics by up to a factor of 3. Our results suggest that quantum information observables are suboptimal probes for resurrecting the interference, and more in general to disentangle the $CP$ properties of new physics