After a first inconclusive sighting, the search for exotic particles that consist of five quarks has been hotly pursued in the past few years. But the weight of evidence is now shifting against their existence.
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Close, F. Vanishing pentaquarks. Nature 435, 287–288 (2005). https://doi.org/10.1038/435287a
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DOI: https://doi.org/10.1038/435287a
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