The BaBar \ Collaboration has observed two new narrow invariant mass states in the D_s sector near 2.32 and 2.46 GeV/c² decaying respectively in D⁺_s\pi ⁰ and D⁺_s\pi ⁰\gamma ; naturally interpreted as c \overline s mesons, they have been denoted as the D^*_sJ(2317)⁺ and the D_sJ(2458)⁺. Their masses, widths and dominant decay modes differ considerably from expectations in current Heavy Quark potential models. Both states have been also observed by Belle and CLEO in the same decay modes and with comparable properties. The observation of these two new mesons has started a very large activity in this sector, both on the experimental and theoretical side.

PACS numbers: 14.40.Lb, 13.25.Ft, 12.40.Yx