Bound states for overlap and fixed point actions close to the chiral limit

被引：4

作者：

Häusler, S ^{[1
]}

Lang, CB ^{[1
]}

机构：

[1] Graz Univ, Inst Theoret Phys, A-8010 Graz, Austria

来源：

PHYSICS LETTERS B | 2001年 / 515卷 / 1-2期

关键词：

lattice field theory; Dirac operator; mass spectrum; Schwinger model;

D O I：

10.1016/S0370-2693(01)00847-4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the overlap and the fixed point Dirac operators for massive fermions in the two-flavor lattice Schwinger model. The masses of the triplet (pion) and singlet (eta) bound states are determined down to small fermion masses and the mass dependence is compared with various continuum model approximations. Near the chiral limit, at very small fermion masses the fixed point operator has stability problems, which in this study are dominated by finite size effects, however. (C) 2001 Published by Elsevier Science B.V.

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页码：213 / 219

页数：7

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