Enhancement near the $\bar{p}\Lambda$ threshold in the ${\chi }_{c0}\to \bar{p}{K}^{+}\Lambda$ reaction

Abstract

We have analyzed the reaction ${\chi }_{c0}\to \bar{p}{K}^{+}\Lambda$ reported by the BESIII Collaboration, taking into account the contributions from the intermediate $K(1830)$, $N(2300)$, and $\Lambda (1520)$ resonances. Our results are in good agreement with the BESIII measurements, and it is found that the anomalous enhancement near the $\bar{p}\Lambda$ threshold is mainly due to the contribution of the $K(1830)$ resonance. We also show that the interference of the high-mass $N^{\ast }$ and ${\Lambda }^{\ast }$ can not produce the anomalous enhancement near the $\bar{p}\Lambda$ threshold.

Comments: 9 pages, 7 figures, the version to be presented in PRD