Scalar-Meson - Baryon Coupling Constants in QCD Sum Rules
Nuclear Theory
2008-11-26 v1
Abstract
The external-field QCD Sum Rules method is used to evaluate the coupling constants of the light-isoscalar scalar meson (``\sigma'' or \epsilon) to the \Lambda, \Sigma, and \Xi baryons. It is shown that these coupling constants as calculated from QCD Sum Rules are consistent with SU(3)-flavor relations, which leads to a determination of the F/(F+D) ratio of the scalar octet assuming ideal mixing: we find \alpha_s \equiv F/(F+D)=0.55. The coupling constants with SU(3) breaking effects are also discussed.
Cite
@article{arxiv.nucl-th/0603058,
title = {Scalar-Meson - Baryon Coupling Constants in QCD Sum Rules},
author = {G. Erkol and M. Oka and Th. A. Rijken and R. G. E. Timmermans},
journal= {arXiv preprint arXiv:nucl-th/0603058},
year = {2008}
}
Comments
15 pages, 8 figures, to be published in Phys. Rev. C