Possible 2S and 1D charmed and charmed-strange mesons

Possible 2S and 1D excited D and D-s states are studied, the charmed states D(2550)(0), D*(2600), D(2750)(0), and D*(2760) newly observed by the BABAR Collaboration are analyzed. The masses of these states are explored within the Regge trajectory phenomenology, and the strong decay widths are computed within the heavy-quark effective theory. Both the mass and the decay width indicate that D(2550)(0) is a good candidate for 2(1)S(0). The strong decay property of D*(2600) and D*(s1)(2700)(+/-) is described well by pure 2(3)S(1) states. If a mixing between 2(3)S(1) and 1(3)D(1) does exist, the mixing angle theta is not large and 2(3)S(1) is predominant. D*(2760) and D*(sJ)(2860)(+/-) are possibly the 1(3)D(3) D, and D-s, respectively. D(2750)(0) and D*(2760) seem two different states, and D(2750)(0) is very possibly the 1D(2(-), 5/2) though the possibility of 1D(2(-), 3/2) has not been excluded. There may exist an unobserved meson D-sJ(2850)(+/-) corresponding to D*(sJ)(2860)(+/-).