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Revisit to Low Mass Scalar Mesons via Unitarized Chiral Perturbation Theory

M. Uehara
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Abstract

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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M. Uehara. 2002-04-02. Revisit to Low Mass Scalar Mesons via Unitarized Chiral Perturbation Theory. https://arxiv.org/abs/hep-ph/0204020

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