Zc(3900)

Zc(3900)Composition| Exotic meson

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Status| On 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]

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 BESIII 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

* XYZ particle
* X(3872)
* Y(4140)
* Z(4430)

## References

1. ↑ . Powel, D. (2013). "Quark quartet opens fresh vista on matter". Nature 498 (7454): 280–281. doi:10.1038/498280a. PMID 23783605. Bibcode: 2013Natur.498..280P.
2. ↑ Ablikim, M. et al. (2013). "Observation of a Charged Charmoniumlike Structure in e+e−→π+π−J/ψ at √s = 4.26 GeV". Physical Review Letters 110 (25): 252001. doi:10.1103/PhysRevLett.110.252001. PMID 23829729. Bibcode: 2013PhRvL.110y2001A.
3. ↑ Liu, Z. Q. et al. (2013). "Study of e+e−→π+π−J/ψ and Observation of a Charged Charmoniumlike State at Belle". Physical Review Letters 110 (25): 252002. doi:10.1103/PhysRevLett.110.252002. PMID 23829730. Bibcode: 2013PhRvL.110y2002L. http://bib-pubdb1.desy.de/record/152255.
4. ↑ Swanson, E. (2013). "Viewpoint: New Particle Hints at Four-Quark Matter". Physics 6: 69. doi:10.1103/Physics.6.69. Bibcode: 2013PhyOJ...6...69S. http://physics.aps.org/articles/v6/69.
5. ↑ 5.0 5.1 5.2 Xiao, T.; Dobbs, S.; Tomaradze, A.; Seth, K. K. (2013). "Observation of the Charged Hadron Z±c(3900) and Evidence of the Neutral Z0c(3900) at √s = 4170 MeV". Physics Letters B 727 (4–5): 366–370. doi:10.1016/j.physletb.2013.10.041. Bibcode: 2013PhLB..727..366X.±c(3900)+and+Evidence+of+the+Neutral+Z0c(3900)+at+√''s''+=+4170+MeV&rft.jtitle=Physics+Letters+B&rft.aulast=Xiao&rft.aufirst=T.&rft.au=Xiao, T.&rft.au=Dobbs, S.&rft.au=Tomaradze, A.&rft.au=Seth, K.+K.&rft.date=2013&rft.volume=727&rft.issue=4–5&rft.pages=366–370&rft_id=info:doi/10.1016/j.physletb.2013.10.041&rft_id=info:bibcode/2013PhLB..727..366X&rfr_id=info:sid/en.wikibooks.org:Physics:Zc(3900)">
6. ↑ "USTC Play a Role in Discovering New Subatomic Particle". University of Science and Technology of China. 6 April 2013. http://en.ustc.edu.cn/news/201304/t20130403_149383.html.
7. ↑ Ablikim, M. et al. (2015). "Observation of Zc(3900)0 in e+ e− to pi0 pi0 J/psi". Physical Review Letters 115 (11): 112003. doi:10.1103/PhysRevLett.115.112003. PMID 26406823. Bibcode: 2015PhRvL.115y2003A.

## External links

* BES III experiment
* Belle experiment

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