发表机构
University of Maryland, College Park; National Taiwan University; National Center for Theoretical Sciences; Shanghai Jiao Tong Unviersity（马里兰大学帕克分校; 台湾大学; 国家理论科学中心; 上海交通大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
采用无介子有效场论NNLO精度计算氘核磁极化率，发现ρ与Z展开方案在NNLO时差异极小，得到不确定度1.3%的新结果，为相关研究提供了更精确的参数。
AI 中文摘要
采用无介子有效场论中次次次领头阶（NNLO）精度，我们计算了氘核标量磁极化率的同位矢量磁偶极贡献。该极化率源于详细平衡和色散积分，其中两个磁流抵消项由热np→dγ反应率确定。常规ρ和Z展开方案在次领头阶差异为12.3%，但在NNLO时仅相差0.165%，这既体现了明显的方案依赖性，也提供了独立的收敛诊断。我们得到β_M0^(M1_v)=0.0789±0.0010 fm³，不确定度为1.3%，相比之前的4.9%有所降低。
英文摘要
Working through next-to-next-to-leading order (NNLO) accuracy in pionless effective field theory, we compute the isovector magnetic-dipole contribution to the scalar deuteron magnetic polarizability. The polarizability follows from detailed balance and a dispersion integral with the two magnetic current counter-terms fixed by the thermal $np\to dγ$ rate. The conventional $ρ$ and $Z$ expansion schemes differ by $12.3\%$ at next-to-leading order but agree to $0.165\%$ at NNLO, resulting an apparent scheme dependence and supplying an independent convergence diagnostic. We obtain $β_{M0}^{(M1_v)}=0.0789\pm0.0010~\mathrm{fm}^{3}$, a $1.3\%$ uncertainty, compared with $4.9\%$ previously.
Comments10 pages, 1 figure
