Abstract
The baryon axial vector current is computed in heavy baryon chiral perturbation theory in the large- limit, where is the number of color charges. One-loop nonanalytic corrections of the order are comprised in the analysis, with contributions of both intermediate octet and decuplet baryon states, to all orders in the expansion of the axial vector current relevant for . Theoretical expressions are obtained in the limit of vanishing decuplet-octet mass difference only, which allows one to carry out a full comparison with conventional heavy baryon chiral perturbation theory results for three flavors of light quarks and at the physical value . Both approaches perfectly agree to all orders considered. Furthermore, a numerical analysis via a least-squares fit is performed in order to extract the values of the free parameters of the theory, using the experimental data available. The predictions of formalism are in good agreement with the experimental data.
- Received 11 February 2021
- Accepted 12 April 2021
DOI:https://doi.org/10.1103/PhysRevD.103.094032
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society