The pentaquark has been theorised to exist for over 50 years, but experimental evidence has been elusive. They are subatomic particles which consist of five quarks, rather than the usual two or three.
In a new paper submitted to the arxiv, and currently under peer review, the LHCb collaboration report observations of these exotic structures. The experimental data shows two resonant states, which, according to the paper, can only be explained by new pentaquarks. The statistical evidence for these states goes beyond nine standard deviations – more than enough for the team to suggest a new discovery.
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