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 $N^*$ and $\Lambda^*$ can not produce the anomalous enhancement near the $\bar{p}\Lambda$ threshold.
Highlights
The hadronic decays of the charmonium states could be used to understand the mechanisms of the charmonium decays and provide a good place to search for the light baryons and mesons, since the charmonium states are the SU(3) singlets, and the final states could provide an isospin filter [1,2,3,4,5,6,7]
With the above formalism, we will fit our model to the p Kþ, ΛKþ, and p Λ mass distributions of the events reported by the BESIII Collaboration [10]
It shows that the high mass Nà and Λà give the contributions in the energy regions of 2100–2600 MeV of the p Λ mass distribution, in the energy regions near the p Λ threshold, which is in agreement with Fig. 5(a) [see the curves labeled as “Nð2300Þ” and “ΛÔ]
Summary
The hadronic decays of the charmonium states could be used to understand the mechanisms of the charmonium decays and provide a good place to search for the light baryons and mesons, since the charmonium states are the SU(3) singlets, and the final states could provide an isospin filter [1,2,3,4,5,6,7]. In 2013, an anomalous enhancement near the p Λ threshold was observed by the BESIII Collaboration in the χc0 → p KþΛ process [10]. The anomalous enhancement near the p Λ threshold may be interpreted as a quasibound dibaryon or as an interference effect of high-mass NÃ and ΛÃ states, as mentioned by Ref. One purpose of this work is to check whether the enhancement structure near the p Λ threshold in the χc0 → p KþΛ process can be interpreted as the highmass NÃ and ΛÃ interference effect or not. One can naturally ask whether the anomalous enhancement near the p Λ threshold is due to the high-mass excited kaon states or.
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