An exploratory study of heavy domain wall fermions on the lattice
An exploratory study of heavy domain wall fermions on the lattice
复制标题
晶格上重畴壁费米子的探索性研究
DOI：
10.1007/jhep04(2016)037
复制
发表时间：
2016
影响因子：
5.4
通讯作者：
J. Tsang
中科院分区：
文献类型：
--
作者：
P. Boyle;A. Juttner;M. Marinković;F. Sanfilippo;M. Spraggs;J. Tsang
本文报道了畴壁费米子作为重夸克晶格正则化的探索性研究。在淬火QCD与树级改进的Symanzik规范行动的框架内，我们确定的离散化效应最小化的参数。我们发现相应的有效四维重叠算子是指数本地的，独立的夸克质量。我们确定了最大裸重夸克质量为amh = 0.4，在此质量以下，近似手征对称性和O（a）-改进的夸克质量是持续的。这个阈值似乎在很大程度上独立于晶格间距。在此基础上，我们对晶格间距在2.0- 5.7GeV范围内的四个系综的重奇异介子色散关系和衰变常数进行了详细的标度研究。我们观察到非常温和的a2标度对连续极限。我们的研究结果建立了坚实的基础，在动力学模拟格点QCD与标准模型唯象学的相关性重的。
A bstractWe report on an exploratory study of domain wall fermions (DWF) as a lattice regularisation for heavy quarks. Within the framework of quenched QCD with the tree-level improved Symanzik gauge action we identify the DWF parameters which minimise discretisation effects. We find the corresponding effective 4d overlap operator to be exponentially local, independent of the quark mass. We determine a maximum bare heavy quark mass of amh ≈ 0.4, below which the approximate chiral symmetry and O(a)-improvement of DWF are sustained. This threshold appears to be largely independent of the lattice spacing. Based on these findings, we carried out a detailed scaling study for the heavy-strange meson dispersion relation and decay constant on four ensembles with lattice spacings in the range 2.0-5.7 GeV. We observe very mild a2 scaling towards the continuum limit. Our findings establish a sound basis for heavy DWF in dynamical simulations of lattice QCD with relevance to Standard Model phenomenology.