Calculation of the axial-vector coupling constant g to two loops in covariant chiral perturbation theory
We present a calculation of the leading two-loop corrections to the axial-vector coupling constant g A in two covariant versions of two-flavor baryon chiral perturbation theory. Taking the low-energy constants from a combined analysis of elastic and inelastic pion-nucleon scattering, we find that these corrections are rather moderate.
Authors
- J. Gegelia (ORCID: https://orcid.org/0000-0002-5720-9978)
- Véronique Bernard (ORCID: https://orcid.org/0000-0003-4748-5167)
- Ulf-G. Meißner (ORCID: https://orcid.org/0000-0003-1254-442X)
- Shayan Ghosh (ORCID: https://orcid.org/0000-0003-0798-7795)
Institutions
- Tbilisi State University (GE)
- Centre National de la Recherche Scientifique (FR)
- University of Bonn (DE)
- Forschungszentrum Jülich (DE)
- Université Paris-Saclay (FR)
- Institut National de Physique Nucléaire et de Physique des Particules (FR)
- Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR)
- Beihang University (CN)
- Ruhr University Bochum (DE)
Publication Details
- Journal
- Physics Letters B
- Published
- 2025-06-06
- DOI
- https://doi.org/10.1016/j.physletb.2025.139637
- Primary Topic
- Quantum Chromodynamics and Particle Interactions
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Canadian Anesthesiologists' Society
- Deutsche Forschungsgemeinschaft
- Shota Rustaveli National Science Foundation
- Ministerium für Innovation, Wissenschaft und Forschung des Landes Nordrhein-Westfalen
- Ministerium für Kultur und Wissenschaft des Landes Nordrhein-Westfalen
- Horizon 2020 Framework Programme
- European Research Council
- Horizon 2020