标题： 手性三核子力在N^4LO I：最长程贡献 显示英文标题

标题： Chiral three-nucleon force at N^4LO I: Longest-range contributions

摘要： 我们推导了三核子力中出现的次次次次次领头阶的两介子交换贡献，在手征有效场论中，这些贡献出现在次次次次次领头阶。 为了确定低能常数，利用在核力推导中采用的幂次计数方案，对重子展开中的次级环序下π-核子散射进行了完整的分析。 我们讨论了这种特定三核子力拓扑结构的手征展开收敛性，并给出了当手征展开截断在次次领头阶时，提供最真实三核子力描述的低能常数的值。 显示英文摘要

摘要： We derive the sub-subleading two-pion exchange contributions to the three-nucleon force which appear at next-to-next-to-next-to-next-to-leading order in chiral effective field theory. In order to determine the low-energy constants, a complete analysis of pion-nucleon scattering at the subleading-loop order in the heavy-baryon expansion is carried out utilizing the power counting scheme employed in the derivation of the nuclear forces. We discuss the convergence of the chiral expansion for this particular three-nucleon force topology and give the values of the low-energy constants which provide the most realistic description of the three-nucleon force when the chiral expansion is truncated at next-to-next-to-leading order.