标题： 格点QCD中最大同位旋下的介子-介子散射长度 显示英文标题

标题： Meson-meson scattering lengths at maximum isospin from lattice QCD

摘要： 我们总结了我们在最大同位旋下对ππ、πK和KK散射s波散射长度的格点QCD确定值，特别关注了物理点的外推以及为了实现这一点而使用的次领头阶卡利那理论。我们使用了三种不同的晶格间距和从约230 MeV到约450 MeV的pion质量的数据，并应用Lüscher的有限体积方法来计算散射长度。我们发现，对于整个pion质量范围，即使是Kaon-Kaon情况下的Kaon质量，零阶卡利那理论也令人惊讶地接近我们的数据。 显示英文摘要

摘要： We summarize our lattice QCD determinations of the pion-pion, pion-kaon and kaon-kaon s-wave scattering lengths at maximal isospin with a particular focus on the extrapolation to the physical point and the usage of next-to-leading order chiral perturbation theory to do so. We employ data at three values of the lattice spacing and pion masses ranging from around 230 MeV to around 450 MeV, applying Luescher's finite volume method to compute the scattering lengths. We find that leading order chiral perturbation theory is surprisingly close to our data even in the kaon-kaon case for our entire range of pion masses.