On lattice actions for static quarks

On lattice actions for static quarks
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关于静态夸克的晶格作用

DOI:
10.1088/1126-6708/2005/08/051
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发表时间:
2005
期刊:
arXiv: High Energy Physics - Lattice
影响因子:
--
通讯作者:
R. Sommer
R. Sommer
中科院分区:
--
文献类型:
--
作者:
M. Della Morte;A. Shindler;R. Sommer

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我们引入了静态夸克作用的新的离散化。他们在静态光相关函数的信噪比上实现了指数级的改进(与艾希顿-希尔正则化相比)。这在一个淬火模拟中得到了明确的验证,并且可以用静态夸克的自能和晶格重夸克在零距离处的势来定量地理解。我们在Schrödinger函数中执行了一组缩放测试,发现O (a)改进理论中的缩放违规相当小——一个可观测值明显小于Eichten-Hill正则化。此外,我们还计算了0 (g0.4)修正下的静态光轴流改进系数和相应的非扰动重整化常数。确定了静态近似下b-夸克质量重正化的正则化相关部分。
We introduce new discretizations of the action for static quarks. They achieve an exponential improvement (compared to the Eichten-Hill regularization) on the signal to noise ratio in static-light correlation functions. This is explicitly checked in a quenched simulation and it is understood quantitatively in terms of the self energy of a static quark and the lattice heavy quark potential at zero distance. We perform a set of scaling tests in the Schrödinger functional and find scaling violations in the O (a) improved theory to be rather small—for one observable significantly smaller than with the Eichten-Hill regularization. In addition we compute the improvement coefficients of the static light axial current up to O (g 0 4) corrections and the corresponding renormalization constants non-perturbatively. The regularization dependent part of the renormalization of the b-quark mass in static approximation is also determined.
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