2+1 flavor QCD with the fixed point action in the $epsilon$-regime.pdf

下载文档

1
0
约1.05万字
约 6页
2017-04-13 发布于江苏
举报
版权申诉
保障服务

2+1 flavor QCD with the fixed point action in the $epsilon$-regime.pdf

1、本文档共6页，可阅读全部内容。
2、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。
3、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。

21flavorQCDwiththefixedpointactioninthe$epsilon$-regime

a r X i v : 0 7 1 0 .0 5 5 1 v 1 [ h e p - l a t ] 2 O c t 2 0 0 7 2+1 flavor QCD with the fixed point action in the ε-regime Peter Hasenfratz a , Dieter Hierl ?b , Vidushi Maillart a , Ferenc Niedermayer a , Andreas Sch?fer b , Christof Weiermann a , Manuel Weingart a BGR (Bern-Graz-Regensburg) Collaboration a Institute for Theoretical Physics, University of Bern, CH-3012 Bern, Switzerland b Institute for Theoretical Physics, University of Regensburg, D-93040 Regensburg, Germany E-mail: dieter.hierl@physik.uni-regensburg.de We generated configurations with the approximate fixed-point Dirac operator DFP on a 12 4 lattice with a ≈ 0.13 fm where the scale was set by r0. The distributions of the low lying eigenvalues in different topological sectors were compared with those of the Random Matrix Theory which leads to a prediction of the chiral condensate. The XXV International Symposium on Lattice Field Theory July 30 - August 4 2007 Regensburg, Germany ? Speaker. c? Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence. http://pos.sissa.it/ 2+1 flavor QCD in the ε-regime Dieter Hierl 1. Introduction The ε-expansion, where mπL? 1 and 4πF 2 L 2 ? 1, is determined by Goldstone boson physics. For that reason it is an excellent tool to determine the low-energy constants of ChPT of QCD. In order to reach this regime the simulation should be done with sufficiently small quark masses. This requires a Dirac operator with good chiral behavior at the actual lattice spacing. This became possible in full QCD only recently [1, 2, 3, 4]. We consider 2+1 light flavor QCD applying the parametrized fixed-point (FP) action [4]. The exact FP action has nice features, most importantly, it has exact chiral symmetry. The parametrized FP action is an approximation which gave very promising results in the quenched approximation, in particular good scaling even at a = 0.15 fm and the spectrum of the FP Dirac operator was cl