$D_s$ mesons are investigated in a semi-classic flux tube model where the spin-orbit interaction is taken into account. Spectrum of D-wave $D_s$ is predicted. The predicted spectrum is much lower than most previous predictions. Analysis of some $D_s$ candidates is made. $D_{ sJ}(2632)^+$ may be a $1^-$ ($j^P={ 3\over 2}^-$ or $1^3D_1$) orbitally excited $D_s$ meson. $D_{ s1}(2700)^\pm$ is very possible the first radially excited $1^-$ ($j^P={ 1\over 2}^-$ or $2^3S_1$) $D_s$ meson (the first radial excitation of $D^{ \star\pm}_s(2112)^0$). $D^\star_{ sJ}(2860)^+$ should be a $3^-$ ($j^P={ 5\over 2}^-$ or $1^3D_3$) orbitally excited $D_s$ meson, and $D_{ sJ}(3040)^+$ is the first radially excited $1^+$ ($j^P={ 1\over 2}^+$) $D_s$ meson. Our conclusions are consistent with the most lately BaBar experiment.
Categories: hep-ph hep-ex