https://doi.org/10.1140/epja/i2008-10635-1
Regular Article - Theoretical Physics
f0(980)-meson as a 
molecule in a phenomenological Lagrangian approach
1
Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, D-72076, Tübingen, Germany
2
Department of Physics, Tomsk, State University, 634050, Tomsk, Russia
* e-mail: thomas.gutsche@uni-tubingen.de
Received:
13
May
2008
Revised:
24
July
2008
Published online:
10
September
2008
We discuss a possible interpretation of the f
0(980)-meson as a hadronic molecule —a bound state of K and mesons. Using a phenomenological Lagrangian approach we calculate the strong f
0(980) → ππ and electromagnetic f
0(980) → γγ decays. The compositeness condition provides a self-consistent method to determine the coupling constant between f
0 and its constituents, K and . Form factors governing the decays of the f
0(980) are calculated by evaluating the kaon loop integrals. The predicted f
0(980) → ππ and f
0(980) → γγ decay widths are in good agreement with available data and results of other theoretical approaches.
PACS: 13.25.Jx Decays of other mesons – / 13.40.Hq Electromagnetic decays – / 14.40.Cs Other mesons with S = C = 0, mass < 2.5 GeV – / 36.10.Gv Mesonic, hyperonic and antiprotonic atoms and molecules –
© SIF, Springer-Verlag Berlin Heidelberg, 2008
