标题： 对中子电偶极矩的奇怪贡献 显示英文标题

标题： A strange contribution to the neutron EDM

摘要： 我们分析假设的夸克电偶极矩对中子电偶极矩（EDM）的贡献。 特别强调对奇异夸克贡献的关注。 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理论中的下一阶计算，所有这些考虑都一致表明，除了偶然抵消的情况外，奇异夸克偶极矩的矩阵元应与价夸克的矩阵元数量级相当。 这意味着在许多超出标准模型的场景中，奇异夸克的EDM为中子EDM提供了主要贡献。 显示英文摘要

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.