Charged charmonium-like states as rescattering effects in B¯→DsJ−D(⁎) decays

Using purely phenomenological approach we show that the peaking structures observed in the ψ(2S)π+ and χc1π+ mass spectra in B¯→ψ(2S)(χc1)π+K decays can be result of (DD¯(⁎))+→(cc¯)resπ+ rescattering in the decays B¯→DsJ−(→D¯(⁎)K)D(⁎). In particular, the position of the peak in the chain B¯→Ds(2S)−D+→K−D¯⁎0D+→K−ψ(2S)π+ coincides well with the measured Z(4430)+ mass, assuming the mass of Ds(2S)− (the first radial excitation of Ds−) to be 2610 MeV/c2. The width of the Z(4430)+ peak is also well reproduced in this approach independently of the width of Ds(2S)−. Although the decay B¯→Ds(2S)−D+ has not been observed so far and even Ds(2S)−-meson is not discovered yet, this decay is expected to have large probability, and the mass of Ds(2S)− is predicted in the range (2600-2650) MeV/c2. The broad bump in χc1π+ spectrum can be attributed to the B¯→Ds(2S)⁎−D+→K−D¯0D+ decay observed with a large branching fraction followed by rescattering D¯0D+→χc1π+.