Light hadron spectroscopy in two-flavor QCD with small sea quark masses
Physical Review D 70 巻
074503- 頁
2004 発行
アクセス数 : 988 件
ダウンロード数 : 200 件
今月のアクセス数 : 3 件
今月のダウンロード数 : 2 件
この文献の参照には次のURLをご利用ください : https://ir.lib.hiroshima-u.ac.jp/00014577
ファイル情報(添付) |
70_074503APS.pdf
512 KB
種類 :
全文
|
タイトル ( eng ) |
Light hadron spectroscopy in two-flavor QCD with small sea quark masses
|
作成者 |
CP-PACS Collaboration
Namekawa Y
Aoki S
Fukugita M
Ishizuka N
Iwasaki Y
Kanaya K
Kaneko T
Kuramashi Y
Lesk V. I.
Ukawa A
Umeda T
Yoshié T
|
収録物名 |
Physical Review D
|
巻 | 70 |
開始ページ | 074503 |
抄録 |
We extend the study of the light hadron spectrum and the quark mass in two-flavor QCD to smaller sea quark mass, corresponding to mPS/mV=0.60–0.35. Numerical simulations are carried out using the RG-improved gauge action and the meanfield-improved clover quark action at beta=1.8 (a=0.2 fm from rho meson mass). We observe that the light hadron spectrum for small sea quark mass does not follow the expectation from chiral extrapolations with quadratic functions made from the region of mPS/mV=0.80–0.55. Whereas fits with either polynomial or continuum chiral perturbation theory (ChPT) fail, the Wilson ChPT (WChPT) that includes a2 effects associated with explicit chiral symmetry breaking successfully fits the whole data: In particular, WChPT correctly predicts the light quark mass spectrum from simulations for medium heavy quark mass, such as mPS/mV>~0.5. Reanalyzing the previous data with the use of WChPT, we find the mean up and down quark mass being smaller than the previous result from quadratic chiral extrapolation by approximately 10%, mudMS-bar(µ=2 GeV)=3.11(17) [MeV] in the continuum limit.
|
NDC分類 |
物理学 [ 420 ]
|
言語 |
英語
|
資源タイプ | 学術雑誌論文 |
出版者 |
The American Physical Society
|
発行日 | 2004 |
権利情報 |
Copyright (c) 2004 The American Physical Society
|
出版タイプ | Version of Record(出版社版。早期公開を含む) |
アクセス権 | オープンアクセス |
収録物識別子 |
[ISSN] 1550-7998
[DOI] http://dx.doi.org/10.1103/PhysRevD.70.074503
~の異版である
|