Four-quark stability

por Javier Vijande (Departament de Física Atòmica, Molecular i Nuclear, Universitat de València)

miércoles 5 nov. 2008 11:30 → 12:30 Europe/Madrid

Aula de Seminarios (Dpto. de Física Atomica, Molecular y Nuclear (UVEG))

In order to discuss the stability of four–quark states against dissociation into two isolated mesons we shall present in this talk an exact method to study four-quark systems based on the hyperspherical harmonics formalism. We shall apply it to several physical systems of interest containing two heavy and two light quarks using different non– relativistic quark-quark potentials. Our conclusions mark the boundaries for the possible existence of compact, non-molecular, four-quark bound states. While QQ¯n¯n states may be stable in nature, the stability of Q¯Qn¯n states would imply the existence of quark correlations not taken into account by simple quark dynamical models. The possible role played by confining interactions not factorizable into simple two-body components will be discussed