Complete spin structure of the pion-nucleon-loop delta self-energy
High Energy Physics - Phenomenology
2022-02-23 v2 Nuclear Theory
Abstract
The complete spin structure of the pion-nucleon-loop contribution to the delta self-energy and dressed propagator is calculated in vacuum, with the most general form of the pion-nucleon-delta vertex. The imaginary parts of the ten Lorentz-scalar coefficients are calculated in closed form, while the real parts are obtained numerically from a dispersion relation. The effect of the pion-nucleon-delta coupling constants and form-factor on the pion-nucleon phase-shift in the spin-3/2 isospin-3/2 channel is studied.
Cite
@article{arxiv.hep-ph/9703339,
title = {Complete spin structure of the pion-nucleon-loop delta self-energy},
author = {C. L. Korpa},
journal= {arXiv preprint arXiv:hep-ph/9703339},
year = {2022}
}
Comments
8 pages, LaTex (uses Revtex and epsf), 2 figures (included), errors in some expressions (including typos) corrected, numerical results affected very little, conclusions unchanged