Journal
PHYSICS LETTERS B
Volume 718, Issue 2, Pages 545-549Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2012.11.009
Keywords
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Funding
- Austrian Science Fund FWF under Erwin-Schrodinger-Stipendium [J3039]
- Helmholtz International Center for FAIR within the LOEWE program of the State of Hesse
- Helmholtz Young Investigator Group [VH-NG-332]
- BMBF [06GI7121]
- Austrian Science Fund (FWF) [J3039] Funding Source: Austrian Science Fund (FWF)
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We determine the mass of tetraquark bound states from a coupled system of covariant Bethe-Salpeter equations. Similar in spirit to the quark-diquark model of the nucleon, we approximate the full four-body equation for the tetraquark by a coupled set of two-body equations with meson and diquark constituents. These are calculated from their quark and gluon substructure using a phenomenologically well-established quark-gluon interaction. For the lightest scalar tetraquark we find a mass of the order of 400 MeV and a wave function dominated by the pion-pion constituents. Both results are in agreement with a meson molecule picture for the f(0)(600). Our results furthermore suggest the presence of a potentially narrow all-charm tetraquark in the mass region 5-6 GeV. (C) 2012 Elsevier B.V. All rights reserved.
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