U_A(1) Breaking Effects on the Light Scalar Meson Spectrum
High Energy Physics - Phenomenology
2009-11-10 v1
Abstract
Effects of the U_A(1) breaking interaction on the low-lying nonet scalar mesons are studied using the extended Nambu-Jona-Lasinio model. The strength of the U_A(1) breaking interaction is determined by the electromagnetic decays of the eta meson. We find that the U_A(1) breaking interaction gives rise to about 150 MeV mass difference between the sigma and a_0 mesons. We also find that the strangeness content in the \sigma meson is about 15%. The calculated mass of the I=1/2 state is about 200 MeV heavier than that of the I=1 state. The order of these masses is not likely to change within this model.
Keywords
Cite
@article{arxiv.hep-ph/0305078,
title = {U_A(1) Breaking Effects on the Light Scalar Meson Spectrum},
author = {Kenichi Naito and Makoto Oka and Makoto Takizawa and Toru Umekawa},
journal= {arXiv preprint arXiv:hep-ph/0305078},
year = {2009}
}
Comments
10 pages, 3 figures