Revisit to Low Mass Scalar Mesons via Unitarized Chiral Perturbation Theory

Details Revisit to Low Mass Scalar Mesons via Unitarized Chiral Perturbation Theory Revisit to Low Mass Scalar Mesons via Unitarized Chiral Perturbation Theory

2002-04-02

arxiv.org/abs/hep-ph/0204020v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 8 epsf figures, LaTeX2e

Scientific paper

We study how the scalar mesons below 1 GeV are generated through the Oller-Oset-Pelaez version of the multichannel inverse amplitude method applied to the chiral perturbation theory. We find out that the f0(980) state is certainly generated as a bound state resonance below the K-Kbar threshold, while the a0(980) state, generated through the channel coupling between the pi-eta and K-Kbar channels, appears as a cusp at the K-Kbar threshold. The so-called sigma(500) and kappa(900) need not be interpreted as the conventional resonances.

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