2007/11/30 by M. V. Carlucci, F. Giannuzzi, G. Nardulli +2 · 1 citation
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-008-0687-2
published as Eur.Phys.J.C57:569-578,2008 · 15 pages, 4 figures
arxiv created 2008/07/23 · arxiv updated 2009/12/01
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 (Schrödinger 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 Ds(2317), Ds(2457) or X(2632) can hardly be interpreted as diquark-antidiquark states within the present approach.