X1(2900) as a D1K molecule

The analyses of the LHCb data on X(2900) in the D- K+ spectrum are performed. Both dynamically generated and explicitly introduced X-1(2900) are considered. The results show that both these two approaches support the interpretation of X-1(2900) as a (D) over bar K-1 molecular state, with J(P) = 1(-) and an iso-singlet interpretation is much more favorable. The effect of triangle singularity on the production of X-1(2900) is also discussed, and it is found that it cannot be interpreted as a pure triangle cusp.

Automated summary

The analyses of LHCb data on X(2900) in the D- K+ spectrum support the interpretation of X-1(2900) as a (D) over bar K-1 molecular state, with J(P) = 1(-) and an iso-singlet interpretation being more favorable. The effect of triangle singularity on the production of X-1(2900) is also discussed, ruling out a pure triangle cusp interpretation.