在大型强子对撞机（LHC）上利用量子层析成像对$HWW$和$HZZ$反常耦合的严格限制
Stringent bounds on $HWW$ and $HZZ$ anomalous couplings with quantum tomography at the LHC
AI总结：
本研究利用量子层析成像研究希格斯玻色子衰变为弱规范玻色子过程，提出基于三个可观测量的策略约束超出标准模型的反常耦合，现有LHC数据下Z道结果可比肩最优限制，纳入常规分析可提升全局拟合约束强度。
摘要：
量子层析成像可实现对量子态密度矩阵的完全重构。我们利用该方法研究希格斯玻色子衰变为弱规范玻色子的过程。超出标准模型的反常耦合可通过基于极化密度矩阵定义的可观测量来施加约束。我们提出了一种基于三个可观测量的策略，这三个可观测量共同给出了最严格的限制。其中两个可观测量与两个规范玻色子极化之间的纠缠相关，另一个则基于一个动量和两个极化的CP-odd组合。我们发现，对于$Z$衰变道，该策略利用现有LHC数据就能得到与当前最优限制相当的结果。我们认为，将这些可观测量纳入常规实验分析中，能够得到更严格的全局拟合限制。
英文摘要：
Quantum tomography provides the full reconstruction of the density matrix of a state. We use it to study the Higgs boson decay into weak gauge bosons. Anomalous couplings beyond the Standard Model can be constrained by means of observables easily defined in terms of the polarization density matrix. We describe a strategy based on three observables that together provide the most stringent limits. Two of these observables are linked to the entanglement between the polarizations of the two gauge bosons, the other is based on CP-odd combinations of one momentum and two polarizations. We find for the $Z$ channel that this strategy offers, already with the available LHC data, limits competitive with the best available bounds. We argue that the inclusion of these observables in routine experimental analyses can lead to more stringent global fit limits.
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