Zc(3900) Explained

The Z_c(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 Z_c(3900) is a decay product of the previously observed anomalous Y(4260) particle.^[6]

The Z_c(3900) in turn decays into a charged pion and a meson. This is consistent with the Z_c(3900) containing four or more quarks.^[5]

The first evidence of the neutral Z_c(3900) was provided by CLEO-c in 2013.^[5] It was later observed by BES III in 2015. It decays into a neutral pion and a meson.^[7]

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

See also

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

External links

• Web site: BES III experiment . home page . Institute of High Energy Physics . Chinese Academy of Sciences . Beijing, CN . ihep.ac.cn .
• Web site: Belle experiment . home page . Ko Energy-kasokuki Kenkyukiko (KEK) ["High Energy Accelerator Research Organization"] . Tsukuba, JP . kek.jp .

Notes and References

1. Powel . D. . 2013 . Quark quartet opens fresh vista on matter . . 498 . 7454 . 280–281 . 10.1038/498280a . free . 2013Natur.498..280P . 23783605.
2. Ablikim . M. . . etal . 2013 . Observation of a charged charmonium-like structure in at . . 110 . 25 . 252001 . 2013PhRvL.110y2001A . 10.1103/PhysRevLett.110.252001 . 23829729 . 11175322 . 1303.5949.
3. Liu . Z.Q. . etal . . 2013 . Study of and observation of a charged charmoniumlike state at Belle . . 110 . 25 . 252002 . 2013PhRvL.110y2002L . 23829730 . 1304.0121 . 10.1103/PhysRevLett.110.252002 . free .
4. Swanson . E. . 2013 . Viewpoint: New particle hints at four-quark matter . . 6 . 69 . 10.1103/Physics.6.69 . free . 2013PhyOJ...6...69S .
5. T. . Xiao . S. . Dobbs . A. . Tomaradze . K.K. . Seth . 2013 . Observation of the charged hadron Z(3900) and evidence of the neutral Z(3900) at . Physics Letters B . 727 . 4–5 . 366–370 . 10.1016/j.physletb.2013.10.041 . 2013PhLB..727..366X . 1304.3036 . 116206390.
6. 6 April 2013 . USTC play a role in discovering new subatomic particle . . 18 June 2013 . 17 October 2013 . https://web.archive.org/web/20131017201914/http://en.ustc.edu.cn/news/201304/t20130403_149383.html .
7. Ablikim . M. . etal . . 2015 . Observation of Zc(3900)0 in . . 115 . 11 . 112003 . 2015PhRvL.115y2003A . 10.1103/PhysRevLett.115.112003 . 26406823 . 119256995 . 1506.06018.