Bonn 2010 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 44: Hadronenstruktur und -spektroskopie VIII
HK 44.3: Talk
Thursday, March 18, 2010, 14:45–15:00, HG IV
Structure of scalar mesons f0(600), a0(980), f0(1370) and a0(1450) — •Denis Parganlija1, Francesco Giacosa1, and Dirk H. Rischke1,2 — 1Insitut für Theoretische Physik, Max-von-Laue-Straße 1, 60438 Frankfurt am Main — 2Frankfurt Institute for Advanced Studies, Ruth-Moufang-Str. 1, 60438 Frankfurt am Main
We present a two-flavour linear sigma model with global chiral symmetry and vector and axial-vector mesons. We calculate pion-pion scattering lengths and the decay widths of scalar, vector and axial-vector mesons. An important question for meson vacuum phenomenology is the quark content of the physical scalar f0(600) and a0(980) mesons. We investigate this question by assigning the quark-antiquark sigma and a0 states of our model with these physical mesons. We show via a comparison with experimental data that this scenario can describe all vacuum properties studied here except for the decay width of the f0(600), which turns out to be too small. We also study the alternative assignment f0(1370) and a0(1450) for the scalar mesons. In this case the decay width of the isoscalar meson agrees with the experimental value.