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The Zc(3900) is a hadron, a type of subatomic particle made of quarks, believed to be the first tetraquark that has been observed experimentally. The discovery was made in 2013 by two independent research groups: one using the BES III detector at the Chinese Beijing Electron Positron Collider, the other being part of the Belle experiment group at the Japanese KEK particle physics laboratory.[1][2][3][4][5]

The Zc(3900) is a decay product of the previously observed anomalous Y(4260) particle.[6] The Zc(3900) in turn decays into a charged pion±) and a J/ψ meson. This is consistent with the Zc(3900) containing four or more quarks.[5]

Researchers are expected to run decay experiments this year to determine its nature with more precision.

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  1. ^ Powel, D. (2013). "Quark quartet opens fresh vista on matter". Nature 498 (7454): 280–281. doi:10.1038/498280a. 
  2. ^ Ablikim, M.; BESIII Collaboration et al. (2013). "Observation of a Charged Charmoniumlike Structure in e+e→π+πJ/ψ at √s = 4.26 GeV". Physical Review Letters 110 (25): 252001. arXiv:1303.5949. Bibcode:2013PhRvL.110y2001A. doi:10.1103/PhysRevLett.110.252001. 
  3. ^ Liu, Z. Q.; Belle Collaboration et al. (2013). "Study of e+e→π+πJ/ψ and Observation of a Charged Charmoniumlike State at Belle". Physical Review Letters 110 (25): 252002. Bibcode:2013PhRvL.110y2002L. doi:10.1103/PhysRevLett.110.252002. 
  4. ^ Swanson, E. (2013). "Viewpoint: New Particle Hints at Four-Quark Matter". Physics 6: 69. Bibcode:2013PhyOJ...6...69S. doi:10.1103/Physics.6.69. 
  5. ^ a b Xiao, T.; Dobbs, S.; Tomaradze, A.; Seth, K. K. (2013). "Observation of the Charged Hadron Z±
    (3900) at √s = 4170 MeV". arXiv:1304.3036 [hep-ex].
  6. ^ "USTC Play a Role in Discovering New Subatomic Particle". University of Science and Technology of China. 6 April 2013. 

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