Nucleon axial charge in lattice QCD with controlled errors

We report on our calculation of the nucleon axial charge g sub(A) in QCD with two flavors 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 ins...

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Bibliographic Details
Published in:Physical review. D, Particles, fields, gravitation, and cosmology Particles, fields, gravitation, and cosmology, 2012-10, Vol.86 (7), Article 074502
Main Authors: Capitani, S., Della Morte, M., von Hippel, G., Jäger, B., Jüttner, A., Knippschild, B., Meyer, H. B., Wittig, H.
Format: Article
Language:English
Subjects:
Charge
Correlation
Gravitation
Insertion
Nucleons
Pions
Quantum chromodynamics
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Summary:We report on our calculation of the nucleon axial charge g sub(A) in QCD with two flavors 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 (ProQuest: Formulae and/or non-USASCII text omitted), in good agreement with the experimental value.
ISSN:1550-7998
1550-2368
DOI:10.1103/PhysRevD.86.074502