Monday, June 25, 2012

1206.5129 (Walter Heupel et al.)

Tetraquark bound states in a Bethe-Salpeter approach    [PDF]

Walter Heupel, Gernot Eichmann, Christian S. Fischer
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.
View original: http://arxiv.org/abs/1206.5129

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