TY  - JOUR
AU  - Güsken, S.
AU  - Ueberholz, P.
AU  - Viehoff, J.
AU  - Eicker, N.
AU  - Lippert, T.
AU  - Schilling, K.
AU  - Spitz, A.
AU  - Struckmann, T.
TI  - Flavor singlet axial vector coupling of the proton with dynamical Wilson fermions
JO  - Physical review / D
VL  - 59
IS  - 11
SN  - 0556-2821
CY  - Melville, NY
PB  - Inst.812068
M1  - FZJ-2020-03099
SP  - 114502
PY  - 1999
AB  - We present the results of a full QCD lattice calculation of the flavor singlet axial vector coupling G1A of the proton. The simulation has been carried out on a 163×32 lattice at β=5.6 with nf=2 dynamical Wilson fermions. It turns out that the statistical quality of the connected contribution to G1A is excellent, whereas the disconnected part is accessible but suffers from large statistical fluctuations. Using a 1st order tadpole improved renormalization constant ZA, we estimate G1A=0.20(12).
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1103/PhysRevD.59.114502
UR  - https://juser.fz-juelich.de/record/860318
ER  -