Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 39: Hadron Structure and Spectroscopy VII
HK 39.6: Vortrag
Mittwoch, 16. März 2016, 18:00–18:15, S1/01 A5
K0∗(800) (or κ) as a companion pole of K0∗(1430) — •Thomas Wolkanowski1, Milena Sołtysiak2, Francesco Giacosa1,2, and Dirk H. Rischke1 — 1Institut für Theoretische Physik, Goethe-Universität Frankfurt am Main, Deutschland — 2Institute of Physics, Jan Kochanowski University Kielce, Poland
We study the light scalar meson sector up to 1.8 GeV in mass using a model Lagrangian which features a single kaonic state (the resonance K0∗(1430)) coupled to kaons and pions. By performing a fit of the parameters of the Lagrangian to π K phase shift data in the I=1/2, J=0 channel, we show that K0∗(800) (or κ) emerges as a dynamically generated companion pole of K0∗(1430). This is a result of resumming quantum fluctuations to one-loop order (with one kaon and one pion running in the loop) in the self-energy of K0∗(1430). We determine the position of the poles in the complex plane. A large-Nc study confirms that K0∗(1430) is predominantly a quarkonium and that K0∗(800) is a molecular-like dynamically generated state.