近日，英国曼彻斯特大学的Claudio Severi及其研究团队取得一项新进展。经过不懈努力，他们对环形轻子对撞机中的量子顶夸克进行研究。相关研究成果已于2024年9月2日在国际知名学术期刊《高能物理杂志》上发表。

该研究团队研究了在非极化束流轻子对撞机中顶夸克对的量子性质，包括自旋关联、纠缠和贝尔不等式的违反。

研究人员在标准模型（SM）和标准模型有效场论（SMEFT）中给出了分析结果，并讨论了几个实际方面，如量子化轴的选择和tt阈值效应。

研究人员还注意到宇称对称性与纠缠之间的对应关系。研究发现，量子可观测量在标准模型中表现出丰富的现象学特征，并且还可以为探测更高能标上的新物理提供额外的助力。

附：英文原文

Title: Quantum tops at circular lepton colliders

Author: Maltoni, Fabio, Severi, Claudio, Tentori, Simone, Vryonidou, Eleni

Issue&Volume: 2024-09-02

Abstract: We study the quantum properties of top quark pairs in lepton colliders with unpolarised beams, including spin correlations, entanglement, and violation of Bell inequalities. We present analytical results in the SM and in the SMEFT and discuss several practical aspects, like the choice of quantisation axes and tt  threshold effects. We also note a correspondence between parity symmetry and entanglement. We find that quantum observables exhibit a rich phenomenology in the SM, and can also provide additional leverage in detecting new physics residing at higher scales.

DOI: 10.1007/JHEP09(2024)001

Source: https://link.springer.com/article/10.1007/JHEP09(2024)001