Chiral Symmetry Aspects of the Scalars
Abstract
Electromagnetic decays of the scalar mesons are shown to be constrained by chiral symmetry as a consequence of the fact that, in the chiral limit, the two and three-point functions and satisfy super-convergent dispersion relations. The QCD asymptotic behavior of the latter is canonical and it can be saturated by a finite number of resonances. The corresponding chiral lagrangian for vector and scalar resonances is constructed. Matching to the correct asymptotic structure generates non-minimal terms which have so far been ignored. It is found that the width can be naturally reproduced suggesting that the is not an exotic particle.
Cite
@article{arxiv.hep-ph/9404353,
title = {Chiral Symmetry Aspects of the Scalars},
author = {B. Moussallam and J. Stern},
journal= {arXiv preprint arXiv:hep-ph/9404353},
year = {2009}
}
Comments
10 pages(latex)+1 fig (postscript file appended), Talk given at workshop "Two-photon physics from Daphne to lep200 and beyond", IPNO/TH 94-26