Tetraquark resonances, flip-flop and cherry in a broken glass model

We develop a formalism to study tetraquarks using the generalized flip-flop potential, which include the tetraquark potential component. Technically this is a difficult problem, needing the solution of the Schr\"odinger equation in a multidimensional space. Since the tetraquark may at any time escape to a pair of mesons, here we study a simplified two-variable toy model and explore the analogy with a cherry in a glass, but a broken one where the cherry may escape from. We also compute the decay width in this two-variable picture, solving the Schr\"odinger equation for the outgoing spherical wave.Comment: 9 pages, 6 figures, 1 table, contribution to the proceedings of MINI-WORKSHOP BLED 2010: DRESSING HADRONS, Bled (Slovenia), July 4 - 11, 201

CP violation in the B0s system

In this paper the most recent Tevatron results concerning CP violation in the B0s system are reviewed. These are the measurement of the direct CP asymmetry in the B0s->K-\pi+ decay performed by CDF and the measurement of \Delta\Gamma_s and \phi_s performed by D0 in the B0s->J/\psi\phi decay.Comment: 8 pages, 11 figures, Proceedings of the "Flavor Physics and CP Violation" Conference (FPCP07), May 12-17 2007, Bled, Sloveni

Mixed symmetric baryon multiplets in large NcN_c QCD: two and three flavours

We propose a new method to study mixed symmetric multiplets of baryons in the context of the $1/N_c$ expansion approach. The simplicity of the method allows to better understand the role of various operators acting on spin and flavour degrees of freedom. The method is tested on two and three flavours. It is shown that the spin and flavour operators proportional to the quadratic invariants of SU$_S$(2) and SU$_F$(3) respectively are dominant in the mass formula.Comment: 7 pages, 2 tables, talk given by Fl. Stancu at Mini-Workshop "Dressing Hadrons", Bled, Slovenia, July 4-11, 201