Second moment of the pion distribution amplitude with the momentum smearing technique
Second moment of the pion distribution amplitude with the momentum smearing technique
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DOI：
10.1016/j.physletb.2017.08.077
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发表时间：
2017-05
影响因子：
4.4
通讯作者：
R. C. G. S. Bali;V. Braun;M. Gockeler;M. Gruber;F. Hutzler;P. Korcyl;B. Lang;A. S. U. Regensburg;T. I. O. F. Research;J. University
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文献类型：
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作者：
R. C. G. S. Bali;V. Braun;M. Gockeler;M. Gruber;F. Hutzler;P. Korcyl;B. Lang;A. S. U. Regensburg;T. I. O. F. Research;J. University
以π介子分布振幅的二阶矩为例，研究了涉及协变导数的局部算子的矩阵元的晶格计算是否可以从最近提出的强子插值的动量涂抹技术中受益。比较的动量涂抹技术，传统的伍珀塔尔涂抹，我们发现，在相同的计算成本，统计误差大大减少。目前的调查进行了使用NF = 2+ 1动态非微扰阶一个改进的威尔逊费米子在晶格上的不同体积和π介子质量下降到220 MeV。
Using the second moment of the pion distribution amplitude as an example, we investigate whether lattice calculations of matrix elements of local operators involving covariant derivatives may benefit from the recently proposed momentum smearing technique for hadronic interpolators. Comparing the momentum smearing technique to the traditional Wuppertal smearing we find—at equal computational cost—a considerable reduction of the statistical errors. The present investigation was carried out using N f= 2+ 1 dynamical non-perturbatively order a improved Wilson fermions on lattices of different volumes and pion masses down to 220 MeV.