We present the results of a full QCD lattice calculation of the flavor singlet axial vector coupling GA¹ 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 GA¹ 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 GA¹=0.20(12).
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Güsken et al. (1999) studied this question.
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