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arXiv 2506.23402hep-phhep-lat
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奇异夸克对中子EDM的奇特贡献

A strange contribution to the neutron EDM

Luca Vecchi

AI总结:

本文分析了假想夸克电偶极子对中子EDM的贡献,特别强调奇异夸克。通过微扰QCD、大N展开、非相对论夸克模型重评及重子有效场论次领头阶计算,发现奇异夸克偶极子矩阵元约为价夸克的十分之一,使其在许多超出标准模型场景中成为中子EDM的主导贡献。

摘要:

我们分析了假想夸克电偶极子对中子电偶极矩(EDM)的贡献。特别强调了奇异夸克的贡献。基于微扰QCD、大N展开、对非相对论夸克模型的批判性重新评估,以及重子有效场论中的次领头阶计算,这些考虑一致表明,除非发生偶然抵消,奇异夸克偶极子的矩阵元应约为价夸克矩阵元的十分之一。这意味着在许多超出标准模型的场景中,奇异夸克EDM对中子EDM提供了主导贡献。

英文摘要:

We analyze the contribution of hypothetical quark electric dipoles to the electric dipole moment (EDM) of the neutron. Particular emphasis is devoted to the strange quark contribution. Considerations based on perturbative QCD, the large N expansion, a critic reassessment of the non-relativistic quark model as well as a next to leading order calculation in heavy baryon effective field theory, all consistently indicate that, barring accidental cancellations, the matrix element of the strange quark dipole should be of order a tenth of those of the valence quarks. This implies that the strange EDM provides the dominant contribution to the neutron EDM in many scenarios beyond the Standard Model.

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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