The nucleon axial charge from lattice QCD with controlled errors

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 insertio...

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Detalles Bibliográficos
Autores principales: Capitani, S, Della Morte, M, von Hippel, G, Jäger, B, Jüttner, A, Knippschild, B, Meyer, H B, Wittig, H
Lenguaje:eng
Publicado: 2012
Materias:
Particle Physics - Lattice
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.86.074502
http://cds.cern.ch/record/1445477
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author Capitani, S
Della Morte, M
von Hippel, G
Jäger, B
Jüttner, A
Knippschild, B
Meyer, H B
Wittig, H
author_facet Capitani, S
Della Morte, M
von Hippel, G
Jäger, B
Jüttner, A
Knippschild, B
Meyer, H B
Wittig, H
author_sort Capitani, S
collection CERN
description 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.
id cern-1445477
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2012
record_format invenio
spelling cern-14454772019-09-30T06:29:59Zdoi:10.1103/PhysRevD.86.074502http://cds.cern.ch/record/1445477engCapitani, SDella Morte, Mvon Hippel, GJäger, BJüttner, AKnippschild, BMeyer, H BWittig, HThe nucleon axial charge from lattice QCD with controlled errorsParticle Physics - LatticeWe 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.arXiv:1205.0180MKPH-T-12-11HIM-2012-02CERN-PH-TH-2012-106oai:cds.cern.ch:14454772012-05-02
spellingShingle Particle Physics - Lattice
Capitani, S
Della Morte, M
von Hippel, G
Jäger, B
Jüttner, A
Knippschild, B
Meyer, H B
Wittig, H
The nucleon axial charge from lattice QCD with controlled errors
title The nucleon axial charge from lattice QCD with controlled errors
title_full The nucleon axial charge from lattice QCD with controlled errors
title_fullStr The nucleon axial charge from lattice QCD with controlled errors
title_full_unstemmed The nucleon axial charge from lattice QCD with controlled errors
title_short The nucleon axial charge from lattice QCD with controlled errors
title_sort nucleon axial charge from lattice qcd with controlled errors
topic Particle Physics - Lattice
url https://dx.doi.org/10.1103/PhysRevD.86.074502
http://cds.cern.ch/record/1445477
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