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Viewpoint: New Particle Hints at Four-Quark Matter

published by American Physical Society
Jun 17, 2013

Two separate groups, both reporting in Physical Review Letters, have seen evidence for a strange particle, called Zc(3900). Although the data is open to other interpretations, it's clear that our understanding of quarks has a long way to go.

http://physics.aps.org/articles/v6/69