Axial amplitudes for Delta excitation in chiral quark models
High Energy Physics - Phenomenology
2009-11-07 v2
Abstract
We study the axial amplitudes for the N-Delta transition in models with quarks and chiral mesons. A set of constraints on the pion field is imposed which enforces PCAC and the off-diagonal Goldberger-Treiman relation. The quark contribution to the amplitudes in general strongly underestimates the C^A_5 amplitude as well as the piNDelta strong coupling constant. We show that the results are considerably improved in models that, in addition to the pion cloud, incorporate a fluctuating sigma field inside the baryon.
Cite
@article{arxiv.hep-ph/0210014,
title = {Axial amplitudes for Delta excitation in chiral quark models},
author = {B. Golli and S. Sirca and L. Amoreira and M. Fiolhais},
journal= {arXiv preprint arXiv:hep-ph/0210014},
year = {2009}
}
Comments
13 pages LaTeX2e, 4 EPS figures within the text; Requires elsart.cls (Submitted for publication in Phys. Lett. B). Section 4 revised