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

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Abstract

We discuss a possible interpretation of the f 0(980)-meson as a hadronic molecule —a bound state of K and \( \bar K \) 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 \( \bar K \). 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.

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Authors and Affiliations

  1. Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, D-72076, Tübingen, Germany

    T. Branz & T. Gutsche

  2. Department of Physics, Tomsk, State University, 634050, Tomsk, Russia

    V. Lyubovitskij

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  1. T. Branz
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  2. T. Gutsche
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Correspondence to T. Gutsche.

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Communicated by J. Bijnens

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Branz, T., Gutsche, T. & Lyubovitskij, V. f0(980)-meson as a \( \bar K \) molecule in a phenomenological Lagrangian approach. Eur. Phys. J. A 37, 303–317 (2008). https://doi.org/10.1140/epja/i2008-10635-1

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