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Pc (4457) has been discovered over five years, but the parity of this particle remains undetermined. In this letter we propose a new interpretation for Pc (4457), which is the state generated from the coupled-channel D⁰c^+ (2595) and ⁰ Pc (4312) since they can exchange an almost on-shell c^+. In this scenario, the parity of Pc (4457) will be positive, which is different from the candidate of the bound state of D^*c. The main decay channel of Pc (4457) in this model is Pc (4312). We propose three processes b⁰ J/ Kₛ p ^-, b⁰ J/ K^- p ⁰, and b⁰ J/ p ^- ^+ K^- to verify Pc (4457) Pc (4312).
Wu et al. (Mon,) studied this question.
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