Resurrection of the Sigma Meson

Details Resurrection of the Sigma Meson Resurrection of the Sigma Meson

1995-11-02

arxiv.org/abs/hep-ph/9511210v1

Phys.Rev.Lett.76:1575-1578,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages in Latex using RevTex (and psfig.sty), 4 figures available as ps files from N. To"rnqvist (Tornqvist@phcu.Helsinki.Fi

Scientific paper

10.1103/PhysRevLett.76.1575

It is shown from a very general model and an analysis of data on the lightest 0++ meson nonet that the f0(980) and f0(1200) resonance poles are two manifestations of the same ss state. Similarily the a0(980) and the a0(1450) are likely to be two manifestations of the same qq state. On the other hand, the uu+dd state, when unitarized and strongly distorted by hadronic mass shifts, becomes an extremely broad Breit-Wigner-like background, m=860 MeV, Gamma=880 MeV, with its pole at s=(0.158-i0.235) GeV^2. This we identify with the sigma meson required by models for spontaneous breaking of chiral symmetry.

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