Zc(3900)

Zc(3900)
CompositionExotic 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.

The Zc(3900) is a decay product of the previously observed anomalous Y(4260) particle.

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.

The first evidence of the neutral Zc(3900) was provided by CLEO-c in 2013. It was later observed by BES III in 2015. It decays into a neutral pion (π0) and a J/ψ meson.

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.