标题： 从简单QED模型的格点规范模拟中得到的剩余介子-介子相互作用 显示英文标题

标题： Residual meson-meson interaction from lattice gauge simulation in a simple QED model

摘要： 对于介子-介子系统，利用动量空间时间关联矩阵的累积（或聚团）展开来计算剩余相互作用。 累积展开用于定义渐近的（或自由的）介子-介子算符。 然后基于完整（相互作用的）和自由（非相互作用的）时间关联矩阵的比较来定义有效相互作用。 所提出的方法可以简单地转录到其他强子-强子系统中，在这里应用于一个简单的二维+一维U(1)格点规范模型，该模型经过调整以使其具有禁闭性。 费米子采用交错方案处理。 有效相互作用表现出排斥芯和中间相对距离处的吸引力。 这些发现与先前使用Lüscher方法对该模型的研究结果一致，在该研究中直接得到了散射相移。 显示英文摘要

摘要： The residual interaction for a meson-meson system is computed utilizing the cumulant, or cluster, expansion of the momentum-space time correlation matrix. The cumulant expansion serves to define asymptotic, or free, meson-meson operators. The definition of an effective interaction is then based on a comparison of the full (interacting) and the free (noninteracting) time correlation matrices. The proposed method, which may straightforwardly be transcribed to other hadron-hadron systems, here is applied to a simple 2+1 dimensional U(1) lattice gauge model tuned such that it is confining. Fermions are treated in the staggered scheme. The effective interaction exhibits a repulsive core and attraction at intermediate relative distances. These findings are consistent with an earlier study of the same model utilizing L\"{u}scher's method where scattering phase shifts are obtained directly.