Meson-meson scattering lengths at maximum isospin from lattice QCD

C. Helmes, C. Jost, B. Knippschild, B. Kostrzewa, Liuming Liu, F. Pittler, C. Urbach, M. Werner
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引用次数: 3

Abstract

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.
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晶格QCD在最大同位旋处的介子-介子散射长度
我们总结了我们在最大同位旋处对介子-介子、介子-介子和介子-介子s波散射长度的晶格QCD测定,特别关注物理点的外推以及次一级手性微扰理论的使用。我们采用晶格间距和介子质量在230 MeV到450 MeV之间的三个值的数据,应用Luescher有限体积法计算散射长度。我们发现,一级手性微扰理论与我们的数据惊人地接近,即使在介子-介子的情况下,我们的整个介子质量范围。
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