f0(980) meson as a K bar K molecule in a phenomenological Lagrangian approach

Details f0(980) meson as a K bar K molecule in a phenomenological Lagrangian approach f0(980) meson as a K bar K molecule in a phenomenological Lagrangian approach

2007-12-03

arxiv.org/abs/0712.0354v2

Eur.Phys.J.A37:303-317,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, 11 figures, revised version accepted for publication in Eur. Phys. J. A

Scientific paper

10.1140/epja/i2008-10635-1

We discuss a possible interpretation of the f0(980) meson as a hadronic molecule - a bound state of K and bar K mesons. Using a phenomenological Lagrangian approach we calculate the strong f0(980) to pi pi and electromagnetic f0(980) to gamma gamma decays. The compositeness condition provides a self-consistent method to determine the coupling constant between f0 and its constituents, K and bar K. Form factors governing the decays of the f0(980) are calculated by evaluating the kaon loop integrals. The predicted f0(980) to pi pi and f0(980) to gamma gamma decay widths are in good agreement with available data and results of other theoretical approaches.

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