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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]

The first evidence of the neutral Zc(3900) was provided by CLEO-c in 2013[5]. It was later observed by BESIII in 2015. It decays into a neutral pion0) and a J/ψ meson.[7]

Researchers were expected to run decay experiments in 2013 to determine the particle's nature with more precision.[citation needed]

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  1. ^ . Powel, D. (2013). "Quark quartet opens fresh vista on matter". Nature. 498 (7454): 280–281. Bibcode:2013Natur.498..280P. doi:10.1038/498280a. PMID 23783605.
  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 c Xiao, T.; Dobbs, S.; Tomaradze, A.; Seth, K. K. (2013). "Observation of the Charged Hadron Z±
    (3900) and Evidence of the Neutral Z0
    (3900) at √s = 4170 MeV". Physics Letters B. 727: 366–370. arXiv:1304.3036. Bibcode:2013PhLB..727..366X. doi:10.1016/j.physletb.2013.10.041.
  6. ^ "USTC Play a Role in Discovering New Subatomic Particle". University of Science and Technology of China. 6 April 2013.
  7. ^ Ablikim, M.; BESIII Collaboration; et al. (2015). "Observation of Zc(3900)0 in e+ e− to pi0 pi0 J/psi". Physical Review Letters. 115 (11): 112003. arXiv:1506.06018. Bibcode:2015PhRvL.115y2003A. doi:10.1103/PhysRevLett.115.112003.

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