2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43643The experimental status of the recently observed resonances which could be interpreted as c$\bar q$ mesons with s$_l^P={1/2}^+$ is reviewed. In the framework of HQET and chiral perturbation theory, strong and radiative widths of these states are computed in the hypothesis that they are c$\bar q$ states, obtaining results consistent with the experimental measurements. Masses and widths for the analogous states containing a beauty quark are also predicted.Latex, 12 pages, 10 eps figures. Talk given at IFAE Conference, Torino, April 14-16, 2004High Energy Physics - Phenomenologytext