Zc(3900)

Last updated
Zc(3900)
Composition Exotic meson
StatusOn hold

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]

Contents

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 (π±) 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 BES III in 2015. It decays into a neutral pion (π0) 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 ]

See also

References

  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.; et al. (BESIII Collaboration) (2013). "Observation of a charged charmonium-like structure in e+e−→π+π−J/ψ at √s = 4.26 GeV". Physical Review Letters . 110 (25): 252001. arXiv: 1303.5949 . Bibcode:2013PhRvL.110y2001A. doi:10.1103/PhysRevLett.110.252001. PMID   23829729. S2CID   11175322.
  3. ↑ Liu, Z.Q.; et al. (Belle Collaboration) (2013). "Study of e+ e− → π+ π− J/ψ and observation of a charged charmoniumlike state at Belle". Physical Review Letters . 110 (25): 252002. arXiv: 1304.0121 . Bibcode:2013PhRvL.110y2002L. doi: 10.1103/PhysRevLett.110.252002 . PMID   23829730.
  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. 1 2 3 Xiao, T.; Dobbs, S.; Tomaradze, A.; Seth, K.K. (2013). "Observation of the charged hadron Z±
    c    (3900) and evidence of the neutral Z0
    c    (3900) at √s = 4170 MeV". Physics Letters B. 727 (4–5): 366–370. arXiv: 1304.3036 . Bibcode:2013PhLB..727..366X. doi:10.1016/j.physletb.2013.10.041. S2CID   116206390.
  6. ↑ "USTC play a role in discovering new subatomic particle" (Press release). University of Science and Technology of China. 6 April 2013. Archived from the original on 17 October 2013. Retrieved 18 June 2013.
  7. ↑ Ablikim, M.; et al. (BESIII Collaboration) (2015). "Observation of Zc(3900)0 in e+ e− → π0 π0 J/ψ". Physical Review Letters . 115 (11): 112003. arXiv: 1506.06018 . Bibcode:2015PhRvL.115y2003A. doi:10.1103/PhysRevLett.115.112003. PMID   26406823. S2CID   119256995.
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