First particle containing four quarks is confirmed.
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References
Liu, Z. Q. et al. Phys. Rev. Lett. 110, 252002 (2013).
Ablikim, M. et al. Phys. Rev. Lett. 110, 252001 (2013).
Chen, K.-F. et al. Phys. Rev. Lett. 100, 112001 (2008).
Adachi, I. et al. Preprint at http://arxiv.org/abs/1105.4583 (2011).
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Blogpost: Avast ye tetraquarks!
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Powell, D. Quark quartet opens fresh vista on matter. Nature 498, 280–281 (2013). https://doi.org/10.1038/498280a
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DOI: https://doi.org/10.1038/498280a
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