Hidden charm ${\mathcal{P}}_{cs}(4338{)}^0$ production in baryonic $B^{-}\to J/\psi \Lambda \bar{p}$ decay

Abstract

We investigate the resonant baryonic $B$ decay $B^{-}\to {\mathcal{P}}_{cs}^0\bar{p},{\mathcal{P}}_{cs}^0\to J/\psi \Lambda$, where ${\mathcal{P}}_{cs}^0\equiv {\mathcal{P}}_{cs}(4338{)}^0$ is identified as a hidden charm pentaquark candidate with strangeness. By interpreting ${\mathcal{P}}_{cs}^0$ as the ${\Xi }_c\bar{D}$ molecule that strongly decays into $J/\psi \Lambda$ and ${\eta }_c\Lambda$, we discover a dominant triangle rescattering effect for $B^{-}\to {\mathcal{P}}_{cs}^0\bar{p}$, initiated by $B^{-}\to J/\psi K^{-}$. Through the exchange of a $\bar{\Lambda }$ anti-baryon, $J/\psi$ and $K^{-}$ undergo rescattering, transforming into ${\mathcal{P}}_{cs}^0$ and $\bar{p}$, respectively. Based on this rescattering mechanism, we calculate $\mathcal{B}(B^{-}\to {\mathcal{P}}_{cs}^0\bar{p},{\mathcal{P}}_{cs}^0\to J/\psi \Lambda )=(1.4_{-1.1}^{+2.1})\times 10^{-6}$, which is consistent with the measured data.

13 pages, 2 figures, 2 tables, matches published version

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