NUCLEON AXIAL FORM-FACTOR FROM LATTICE QCD

被引：46

作者：

LIU, KF ^{[1
]}

DONG, SJ ^{[1
]}

DRAPER, T ^{[1
]}

WU, JM ^{[1
]}

WILCOX, W ^{[1
]}

机构：

[1] BAYLOR UNIV,DEPT PHYS,WACO,TX 76798

来源：

PHYSICAL REVIEW D | 1994年 / 49卷 / 09期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevD.49.4755

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Results for the isovector axial form factors of the proton from a lattice QCD calculation are presented for both the point-split and local currents. They are obtained on a quenched 16(3) x 24 lattice at beta = 6.0 with Wilson fermions for a range of quark masses from strange to twice the charm mass. For each quark mass, we find that the axial form factor falls off slower than the corresponding proton electric form factor. Results extrapolated to the chiral limit show that the q2 dependence of the axial form factor agrees quite well with experiment. The axial vector coupling constant g(A) calculated for the point-split and local currents is 1.20 +/- 0.11 and 1.18 +/- 0.11. The central values are 4% and 6% smaller than the experimental value of 1.254, respectively. We also consider the large ma correction and renormalization for the axial vector current of heavy quarks.

引用

页码：4755 / 4761

页数：7

共 26 条

[1] STATIC PROPERTIES OF NUCLEONS IN THE SKYRME MODEL [J].