LHCb experiment discovers a new pentaquark

The LHCb collaboration has observed a new pentaquark particle and has confirmed the pentaquark structure previously reported

The LHCb collaboration has announced the discovery of a new pentaquark particle. The new particle is a lighter companion to these pentaquark structures and its existence sheds new light into the nature of the entire family. As well as revealing the new P (4312)+ particle, the analysis also uncovered a more complex structure of P (4450)+ consisting of two narrow overlapping peaks, P (4440)+ and P (4457)+, with the two-peak structure having a statistical significance of 5.4 sigma.

Source: home.cern