TY - JOUR
T1 - Flavor-singlet gA from lattice QCD
AU - Dong, S. J.
AU - Lagaë, J. F.
AU - Liu, K. F.
PY - 1995
Y1 - 1995
N2 - We report on a lattice QCD calculation of the flavor-singlet axial coupling constant gA of the proton from the axial-vector current. The simulation is carried out at =6 on a quenched 163×24 lattice. An extrapolation to the chiral limit shows that the connected insertion (valence and cloud parts) is 0.620.09, which is close to gA8. The disconnected insertion (vacuum polarization from the sea quark) for the u or d quark is -0.120.01 and the s quark also contributes -0.120.01. The total gA0 is thus 0.250.12, which is in agreement with experiments. In addition, we find gA3=1.200.11, gA8=0.610.13, and FA/DA=0.600.02, also in agreement with experiments.
AB - We report on a lattice QCD calculation of the flavor-singlet axial coupling constant gA of the proton from the axial-vector current. The simulation is carried out at =6 on a quenched 163×24 lattice. An extrapolation to the chiral limit shows that the connected insertion (valence and cloud parts) is 0.620.09, which is close to gA8. The disconnected insertion (vacuum polarization from the sea quark) for the u or d quark is -0.120.01 and the s quark also contributes -0.120.01. The total gA0 is thus 0.250.12, which is in agreement with experiments. In addition, we find gA3=1.200.11, gA8=0.610.13, and FA/DA=0.600.02, also in agreement with experiments.
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U2 - 10.1103/PhysRevLett.75.2096
DO - 10.1103/PhysRevLett.75.2096
M3 - Article
AN - SCOPUS:4243818985
SN - 0031-9007
VL - 75
SP - 2096
EP - 2099
JO - Physical Review Letters
JF - Physical Review Letters
IS - 11
ER -