We calculate the two-loop heavy quarkonium Hamiltonian within potential-nonrelativistic-QCD effective field theory in the nonannihilation channel. This calculation represents the first nontrivial step toward determining the N4LO Hamiltonian in the weak coupling regime. The large amount of computation is systematically handled by employing the β expansion, differential equations for master integrals, and adopting a single-step matching procedure, in contrast to the conventional two-step approach. Published by the American Physical Society 2024

中文翻译：

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非湮没通道中的双环 Quarkonium 哈密顿量


我们在非湮没通道中计算了势-非相对论-QCD 有效场论中的双环重石英哈密顿量。该计算代表了在弱耦合情况下确定 N4LO 哈密顿量的第一步。与传统的两步方法相比，通过采用β展开、主积分微分方程并采用单步匹配程序来系统地处理大量计算。 美国物理学会 2024 年出版