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Scalar mesons as a mixing of two- and four-quark states

Abstract : The scalar mesons are a puzzling problem in meson spectroscopy: they appear to be too numerous and with a mass often incompatible with usual quark-quark potentials. In this paper, we study the possibility to describe them as a mixing of states composed of one and two quark-antiquark pairs. A potential containing confinement, gluon exchange and boson exchange, as expected from chiral symmetry, is used in a consistent way to calculate the two and four quark states separately. Then, a coupling between these states is introduced as a constant term depending only on the flavour of the created pair. The description is largely improved. To refine the treatment, a coupling with a glueball is also considered. All the experimental resonances seem to fit correctly in this scheme.
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Conference papers
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http://hal.in2p3.fr/in2p3-00025358
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Submitted on : Wednesday, January 11, 2006 - 3:46:54 PM
Last modification on : Monday, July 20, 2020 - 9:18:27 AM

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B. Silvestre-Brac, J. Vijande, F. Fernandez, A. Valcarce. Scalar mesons as a mixing of two- and four-quark states. 11th International Conference on Hadron Spectroscopy (Hadron05), Aug 2005, Rio de Janeiro, Brazil. pp.665-669, ⟨10.1063/1.2176561⟩. ⟨in2p3-00025358⟩

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