Moments of Nucleon Light Cone Quark Distributions Calculated in Full Lattice QCD
Moments of Nucleon Light Cone Quark Distributions Calculated in Full Lattice QCD
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DOI：
10.1103/physrevd.66.034506
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发表时间：
2002-01
影响因子：
5
通讯作者：
Lhpc Collaboration;S. C. D. Dolgov;R. Brower;S. Capitani;P. Dreher;J. Negele;A. Pochinsky;D. Renner;N. Eicker;T. Lippert;K. Schilling;R. Edwards;U. Heller
中科院分区：
文献类型：
--
作者：
Lhpc Collaboration;S. C. D. Dolgov;R. Brower;S. Capitani;P. Dreher;J. Negele;A. Pochinsky;D. Renner;N. Eicker;T. Lippert;K. Schilling;R. Edwards;U. Heller
在非猝灭格点QCD中计算了夸克密度、螺旋度和横度分布的矩。在16{sup 3} × 32格子上，利用SESAM合作组的组态和SCRI组态分别计算了与这些矩对应的算符的质子矩阵元.包括单圈微扰重整化修正。在夸克质量在目前的计算中，淬火和完整的QCD结果之间没有统计上的显着差异，表明来自狄拉克海的夸克-反夸克激发的贡献很小。与冷却配置基本上只包含瞬子和完整的胶子配置的计算之间的密切协议表明，夸克零模式与瞬子起主导作用。简单的线性外推的完整的QCD计算的物理π介子质量产生的结果与实验不一致。外推到手征极限，包括物理学的π云可以解决这个矛盾和一个明确的手征外推的要求进行了说明。
Moments of the quark density, helicity, and transversity distributions are calculated in unquenched lattice QCD. Calculations of proton matrix elements of operators corresponding to these moments through the operator product expansion have been performed on the 16{sup 3} x 32 lattices for Wilson fermions at Beta=5.6 using configurations from the SESAM collaboration and at Beta = 5.5 using configurations from SCRI. One-loop perturbative renormalization corrections are included. At quark masses accessible in present calculations, there is no statistically significant difference between quenched and full QCD results, indicating that the contributions of quark-antiquark excitations from the Dirac Sea are small. Close agreement between calculations with cooled configurations containing essentially only instantons and the full gluon configurations indicates that quark zero modes associated with instantons play a dominant role. Naive linear extrapolation of the full QCD calculation to the physical pion mass yields results inconsistent with experiment. Extrapolation to the chiral limit including the physics of the pion cloud can resolve this discrepancy and the requirements for a definitive chiral extrapolation are described.