2012

The nucleon axial charge from lattice QCD with controlled errors

Capitani, S., Della Morte, M., von Hippel, G. et al.

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We report on our calculation of the nucleon axial charge gA in QCD with two flavours of dynamical quarks.

A detailed investigation of systematic errors is performed, with a particular focus on contributions from excited states to three-point correlation functions.
The use of summed operator insertions allows for a much better control over such contamination.
After performing a chiral extrapolation to the physical pion mass, we find gA=1.223 +/- 0.063 (stat) +0.035 -0.060 (syst), in good agreement with the experimental value.

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