Branching fractions of B- → D- X0,1(2900) and their implications

The exotic states X-0,X-1(2900) with the quark flavor of cs (u) over bar(d) over bar are recently observed in the mass spectrum of D+K- in B- -> D-D+K- by the LHCb collaboration. To explore the nature of X-0,X-1(2900), except for analyzing their masses and decay widths as usually did in literatures, the study of their production mechanism in B-meson weak decays would provide another important information. The amplitude of B--> D-X0,1 is non-factorizable. We consider the final-state-interaction effects and calculate them via the rescattering mechanism. The measured branching fractions of B--> D-X0,1 are revealed. It is manifested by B-->Lambda(-)(c) Xi((')0)(c) and Lambda(0)(b) -> Pc+K- that the rescattering mechanism can result in the relatively large branching fractions. The similar processes of B-->pi X--(0,1) are also analyzed. The isospins of X-0,X-1 can be investigated by B -> DX0,1 +/-,0 decays.

Automated summary

The study focuses on the production mechanism and decay processes of X-0,X-1(2900), and finds that the rescattering mechanism can result in relatively large branching fractions. The isospin can be investigated through B -> DX0,1 +/-,0 decays.