2015/08/05 by Oliver Bär, Oliver Bar, Bar, Oliver
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Superconducting Materials and Applications #hep-lat
paper · pdf · doi:10.48550/arxiv.1508.01021
7 pages, 4 figures. Talk given at the 33rd International Symposium on Lattice Field Theory, 14 - 18 July 2015, Kobe, Japan
arxiv created 2015/08/05 · openalex publication_date 2015/08/05 · arxiv updated 2015/08/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The nucleon-pion-state contributions to QCD 2- and 3-point functions used in the calculation of the nucleon axial charge are studied in chiral perturbation theory. For sufficiently small quark masses and large volumes the nucleon-pion states are expected to have smaller total energy than the single-particle excited states. To leading order in chiral perturbation theory the results do not depend on low-energy constants associated with the interpolating nucleon fields and apply to local as well as smeared interpolators. The nucleon-pion-state contribution is found to be at the few percent level.