2004年12月
Twisted mass QCD, O(a) improvement, and Wilson chiral perturbation theory
PHYSICAL REVIEW D
- ,
- 巻
- 70
- 号
- 11
- 開始ページ
- 116011-1-116011-14
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevD.70.116011
- 出版者・発行元
- AMERICAN PHYSICAL SOC
We point out a caveat in the proof for automatic O(a) improvement in twisted mass lattice QCD at maximal twist angle. With the definition for the twist angle previously given by Frezzotti and Rossi, automatic O(a) improvement can fail unless the quark mass satisfies m(q)>>a(2)Lambda(QCD)(3). We propose a different definition for the twist angle which does not require a restriction on the quark mass for automatic O(a) improvement. In order to illustrate explicitly automatic O(a) improvement we compute the pion mass in the corresponding chiral effective theory. We consider different definitions for maximal twist and show explicitly the absence or presence of the leading O(a) effect, depending on the size of the quark mass.
- リンク情報
- ID情報
-
- DOI : 10.1103/PhysRevD.70.116011
- ISSN : 0556-2821
- Web of Science ID : WOS:000226054700100