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arXiv 2602.21311hep-phhep-exquant-ph
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相干量子评估碰撞振幅以约束有效场论限制

Coherent Quantum Evaluation of Collider Amplitudes for Effective Field Theory Constraints

University of Bern（伯尔尼大学）；European Organization for Nuclear Research (CERN)（欧洲核子研究组织（CERN））；Max Planck Institute of Quantum Optics（马克斯·普朗克量子光学研究所）；Ludwig Maximilian University of Munich（慕尼黑大学）；Munich Center for Quantum Science and Technology (MCQST)（慕尼黑量子科学与技术中心）；Leiden University（莱顿大学）；Kyung Hee University（庆熙大学）

Yacine Haddad, Kaidi Xu, Vincent Croft, Jad C. Halimeh, Michele Grossi

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AI总结：

该研究提出了一种混合量子-经典框架，用于在量子硬件上计算碰撞振幅并约束有效场论算子，通过相干结合图示贡献实现高精度测量。

摘要：

电子-正电子碰撞的高精度测量为标准模型提供了严格测试，并成为探测可能的高维相互作用的强大探针。我们提出了一种混合量子-经典框架，用于在基于门的量子硬件上计算电子对散射的Leading-order helicity振幅，并利用由此产生的截面来约束标准模型耦合和有效场论算子。在我们的方法中，外部动力学被编码为单量子比特Weyl旋量，通过在单个量子电路中相干地结合图示贡献来重建完整的helicity振幅。经典后处理产生可以与碰撞数据直接比较的物理振幅和微分截面。作为概念验证，我们计算了无极化角分布，并对高精度电子-正电子测量进行了分箱似然拟合。提取的界限在统计上与标准模型预期一致，证明了量子辅助振幅评估可以直接与现象学分析和实验数据对接。这项工作为将量子计算应用于高精度碰撞物理和有效场论研究建立了切实可行的途径。

英文摘要：

Precision measurements at electron-positron colliders provide stringent tests of the Standard Model and powerful probes of possible higher-dimensional interactions. We present a hybrid quantum-classical framework for computing leading-order helicity amplitudes for $e^+e^-\to \ell^+\ell^-$ scattering on gate-based quantum hardware and using the resulting cross sections to constrain both Standard Model couplings and effective field theory operators. In our approach, external kinematics are encoded into single-qubit Weyl spinors, and full helicity amplitudes are reconstructed by coherently combining diagrammatic contributions within a single quantum circuit. Classical post-processing yields physical amplitudes and differential cross sections that can be directly compared with collider data. As a proof of concept, we compute unpolarised angular distributions and perform binned likelihood fits to precision electron-positron measurements. The extracted bounds are statistically consistent with Standard Model expectations, demonstrating that quantum-assisted amplitude evaluation can interface directly with phenomenological analyses and experimental data. This work establishes a concrete pathway toward applying quantum computing to precision collider physics and effective field theory studies.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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