2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43247Within the framework of the heavy quark effective theory, QCD sum rules are used to calculate the masses of p-wave (c-bar s) states. The results for 0^+ and 1^+ states with the angular momentum of the light component j_l=1/2 are consistent with the experimental values for D_s(2317) and D_s(2457), respectively.4 pages, no figure, talk at ICFP 2003, Seoul, 6-11 Oct. 2003High Energy Physics - Phenomenologytext