标题： 小夸克质量下扭曲质量格点QCD的三点函数 显示英文标题

标题： 3-point functions from twisted mass lattice QCD at small quark masses

摘要： 我们以扭曲-2非奇异算符的π态之间的矩阵元为例表明，Wilson twisted质量费米子允许计算这个有物理意义的量，其赝标质量为O(270 MeV)。 在淬火近似下，我们通过应用两种临界质量定义来研究该可观测量的标度行为，该可观测量来源于一个3点函数，发现在这两种情况下都与预期的O(a^2)行为一致。 联合连续外推允许在小π介子质量下获得可靠的结果，这些结果以前无法通过格点QCD模拟来探索。 显示英文摘要

摘要： We show at the example of the matrix element between pion states of a twist-2, non-singlet operator that Wilson twisted mass fermions allow to compute this phenomenologically relevant quantitiy at small pseudo scalar masses of O(270 MeV). In the quenched approximation, we investigate the scaling behaviour of this observable that is derived from a 3-point function by applying two definitions of the critical mass and find a scaling compatible with the expected O(a^2) behaviour in both cases. A combined continuum extrapolations allows to obtain reliable results at small pion masses, which previously could not be explored by lattice QCD simulations.