We present the observation of two exotic pentaquark baryon candidates, which decay into J/ψp, in Λb0→J/ψK−p decays by LHCb experiment. An amplitude analysis of the three-body final state reproduces the two-body mass and angular distributions. The significance of each of these resonances is more than 9 standard deviations. We also discuss the implication of the two pentaquark candidates.                                

Host: Prof. Haijun Yang