Chiral Symmetry Aspects of the Scalars

Details Chiral Symmetry Aspects of the Scalars Chiral Symmetry Aspects of the Scalars

1994-04-29

arxiv.org/abs/hep-ph/9404353v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages(latex)+1 fig (postscript file appended), Talk given at workshop "Two-photon physics from Daphne to lep200 and beyond"

Scientific paper

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 $a_0(980)\to2\gamma$ can be naturally reproduced suggesting that the $a_0(980)$ is not an exotic particle.

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