Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-11-13
Eur.Phys.J.C57:569-578,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, 4 figures
Scientific paper
10.1140/epjc/s10052-008-0687-2
AdS/QCD correspondence predicts the structure of quark-antiquark potential in the static limit. We use this piece of information together with the Salpeter equation (Schr\"odinger equation with relativistic kinematics) and a short range hyperfine splitting potential to determine quark masses and the quark potential parameters from the meson spectrum. The agreement between theory and experimental data is satisfactory provided one considers only mesons comprising at least one heavy quark. We use the same potential (in the one-gluon-exchange approximation) and these data to estimate constituent diquark masses. Using these results as an input we compute tetraquark masses using a diquark-antidiquark model. The masses of the states X(3872) or Y(3940) are predicted rather accurately. We also compute tetraquark masses with open charm and strangeness. Our result is that tetraquark candidates such as D_s(2317), D_s(2457) or X(2632) can hardly be interpreted as diquark-antidiquark states within the present approach.
Carlucci Maria Valentina
Giannuzzi Floriana
Nardulli Giuseppe
Pellicoro Mario
Stramaglia Sebastiano
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