单圈级重夸克真空极化的截止效应
Cutoff effects of heavy quark vacuum polarization at one-loop order
摘要:
在晶格模拟中,粲夸克质量通常距离截止值1/a不远。它的决定因素可能会潜在地引入大的截止效应。我们选择O(a)-改进的Wilson公式,计算了单圈级两个不同观测量的真空极化效应。一个是夸克-反夸克静力,另一个是薛定谔泛函耦合,此外,我们还研究了由后者产生的另外两个量。在所有情况下,与胶子效应相比,由粲夸克引起的晶格伪影都很小。这表明在动力学费米子模拟中包含粲夸克通常不是问题。
英文摘要:
The charm-quark mass is typically not so far from the cutoff 1/a in lattice simulations. Its determinant may then potentially introduce large cutoff effects. We choose the O(a)-improved Wilson formulation and compute the vacuum polarization effects in two rather different observables at one-loop order. One is the quark-antiquark static force and the other the Schroedinger functional coupling; in addition we investigate two more quantities resulting from the latter. In all the cases the lattice artifacts due to the charm-quark are small when compared to the gluonic effects. This indicates that the inclusion of charm-quarks in dynamical fermion simulations is typically not a problem.
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