1Member of JSCE, M. Eng., Ocean Engineering Study Program, Faculty of Engineering, Hasanuddin University (Jl. P. Kemerdekaan km. 10, Makassar 90245, Indonesia) 2Member of JSCE, M. Eng., Graduate School of Engineering, Tohoku University (6-6-11-1110 Aoba Aramaki Aoba-ku, Sendai 980-8579, Japan) 3Fellow of JSCE, Professor, Graduate School of Engineering, Tohoku University (6-6-11-1110 Aoba Aramak...

We review the spectrum of lightest scalar resonances recently determined using dispersion techniques. The conceptual difference between the pole mass and the bare mass (or the line–shape mass) is stressed. The nature of the lightest scalars are discussed and we argue, without relying on any model details, that the σ(500), κ(700), a0(980) and f0(980) may be understood as chiral partners of the N...

We estimate the di-photon coupling of f0(600), f0(980) and f2(1270) resonances in a couple channel dispersive approach. Especially we estimate the di-photon coupling of the third sheet pole located near K̄K threshold, denoted as f III 0 (980). It is argued that this third sheet pole may be originated from a couple channel Breit-Wigner description of the f0(980) resonance. The f0(600) di-photon c...

A coupled channel model of the a0(980) and a0(1450) resonances has been constructed using the separable πη and KK interactions. We have shown that two S–matrix poles corresponding to the a0(980) meson have significantly different widths in the complex energy plane. The KK to πη branching ratio, predicted in our model near the a0(1450) mass, is in agreement with the result of the Crystal Barrel ...

Lineage-Specific Coexpression Yuichi Aoki, Yasunobu Okamura, Shu Tadaka, Kengo Kinoshita and Takeshi Obayashi* Graduate School of Information Sciences, Tohoku University, 6-3-09, Aramaki-Aza-Aoba, Aoba-ku, Sendai, 980-8679 Japan Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Kawaguchi, Saitama, Japan Institute of Development, Aging, and Cancer...

In the light scalar meson sector (M < ∼ 1.8 GeV) one expects at least one qq̄ nonet and a glueball, possibly also multi-quark states. We discuss the present phenomenological evidence for σ and κ particles; if real, they could be members of the lightest (quark or multi-quark) nonet together possibly with a0(980) and f0(980). Alternatively, the lightest nonet could include f0(980) but not σ and κ ...

We perform a Faddeev calculation for the three mesons system, φKK̄, taking the interaction between two pseudoscalar mesons and between a vector and a pseudoscalar meson from the chiral unitary approach. We obtain a neat resonance peak around a total mass of 2150 MeV and an invariant mass for the KK̄ system around 970 MeV, very close to the f0(980) mass. The state appears in I=0 and qualifies as a...