Study of lattice QCD by large scale numerical simulations including dynamical quark effects

通过大规模数值模拟（包括动态夸克效应）研究晶格 QCD

基本信息

批准号：
15540279
负责人：
OKAWA Masanori
金额：
$ 2.24万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15540279/
关键词：
Lattice QCD Dynamical quark Hadron matrix element

项目摘要

Including dynamical quark loop effects in lattice QCD simulations is one of the most important problem to make quantitative study of strong interaction and to obtain phenomenologically important hadronic matrix elements. In fact, in the quenched approximation where the dynamical quark loop effect is neglected, it has been shown that the evaluated hadron mass spectra deviate from experimental values by about 5-10%. It has also been shown recently that about half part of the deviation in hadron mass spectra observed in the quenched approximation disappears with the inclusion of the dynamical loop effect of u and d quarks. In the real world, however, there are three light quarks, u,d and s quarks, and it is important to verify if the remaining deviation disappears by the inclusion of the s quark loop effect. For this purpose we have made realistic (2+1) flavor QCD simulation with O(a) improved Wilson fermions in which the discretization error of lattice QCD simulation is known to be O(a^2) with a the lattice spacing. We have calculated hadron mass spectra on two lattices having lattice spacing a【approximately equal】 0.1fm and 0.12fm. We have extrapolated hadron masses to a=0 assuming a^2 dependence of hadron masses evaluated on lattices with finite a, and found that preliminary values of extrapolated hadron masses are consistent with experimental values. Evaluation of phenomenologically important various hadronic matrix elements such as decay constants have also been done including the dynamical loop effect of u and d quarks.

在晶格QCD模拟中包含动态夸克循环是最重要的问题，即在现象学上重要的黑构矩阵元素中，在淬灭的近似值中，忽略了动态夸克环EIS。在淬灭近似中观察到的强子质谱的偏差约为5-10％。，D和S Quarks sappears通过包含S夸克环效应。 A晶格间距。也已经完成了这种屁股的de齿，包括和Quarks的动态循环效应。

项目成果

期刊论文数量（50）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

S.Aoki: "B^0-B^^-^0 mixing in unquenched lattice QCD"Physical Review Letters. 91. 212001 1-212001 4 (2003)

S.Aoki：“B^0-B^^-^0 在未淬火晶格 QCD 中混合”物理评论快报。

DOI：
发表时间：
期刊：
影响因子：
0
作者：
通讯作者：

Non-perturbative O(a)-improvement of Wilson quark action in three-flavor QCD with plaquette gauge action

具有血小板规范作用的三味 QCD 中威尔逊夸克作用的非微扰 O(a) 改进

DOI：
发表时间：
2005
期刊：
Phys. Rev. D 71
影响因子：
0
作者：
Aoki;W.;et al.;N.Yamada
通讯作者：
N.Yamada

I=2 pion scattering length from two-pion wave functions

I=2 π 介子散射长度（来自二π 介子波函数）

DOI：
发表时间：
2005
期刊：
Physical Review D71
影响因子：
0
作者：
N.Yamada;S.Aoki
通讯作者：
S.Aoki

Light hadron spectroscopy in two-flavor QCD with small sea quark masses

小海夸克质量的双味 QCD 中的光强子光谱

DOI：
发表时间：
2004
期刊：
Phys. Rev. D 70
影响因子：
0
作者：
K.Sadakane;T.Ohnishi;M.Ohkubo;Y.Takeda;Y.Takeda et al.;E.Shintani et al.;Tatsuyuki Takatsuka;S.Aoki;K.Sadakane et al.;Tatsuyuki Takatsuka;Y.Namekawa
通讯作者：
Y.Namekawa

Heavy quark expansion parameters from lattice NRQCD

晶格 NRQCD 的重夸克膨胀参数