Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-12-05
Physics
High Energy Physics
High Energy Physics - Phenomenology
Invited talk at 26th International Colloquia in Group Theoretical Methods in Physics (XXVI ICGTMP), New York City, USA, 26-30
Scientific paper
A classification of tetraquark states in terms of the spin-flavour, colour and spatial degrees of freedom has been constructed. The permutational symmetry properties of both the spin-flavour and orbital parts of the quark-quark and antiquark-antiquark subsystems are briefly discussed. This classification is useful both for model-builders and experimentalists. An evaluation of the tetraquark spectrum is obtained from a Iachello mass formula for tetraquark systems. The ground state tetraquark nonet is identified with $f_{0}(600)$, $\kappa(800)$, $f_{0}(980)$, $a_{0}(980)$. The mass splittings predicted by this mass formula are in agreement with the KLOE, Fermilab E791 and BES experimental data.
Galata' Giuseppe
Santopinto Elena
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