Discretization effects in the topological susceptibility in lattice QCD

被引：6

作者：

Hart, A ^{[1
]}

机构：

[1] Univ Edinburgh, Sch Phys, Edinburgh EH9 3JZ, Midlothian, Scotland

来源：

PHYSICAL REVIEW D | 2004年 / 69卷 / 07期

关键词：

D O I：

10.1103/PhysRevD.69.074510

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the topological susceptibility chi in QCD with two quark flavors using lattice field configurations that have been produced with an O(a)-improved clover quark action. We find clear evidence for the expected suppression at a small quark mass m(q) and examine the variation of chi with this mass and the lattice spacing a. A joint continuum and chiral extrapolation yields good agreement with theoretical expectations as a,m(q)-->0. A moderate increase in autocorrelation is observed on the more chiral ensembles, but within large statistical errors. Finite volume effects are negligible for the Leutwyler-Smilga parameter x(LS)greater than or similar to10, and no evidence for a nearby phase transition is observed.

引用

页数：6

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