Zc(3900)
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]
Researchers are expected to run decay experiments this year to determine its nature with more precision.
References
- ^ Powel, D. (2013). "Quark quartet opens fresh vista on matter". Nature. pp. 280–281. doi:10.1038/498280a.
- ^
Ablikim, M. (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. arXiv:1303.5949. Bibcode:2013PhRvL.110y2001A. doi:10.1103/PhysRevLett.110.252001.
{{cite journal}}: Unknown parameter|coauthors=ignored (|author=suggested) (help) - ^
Liu, Z. Q. (2013). "Study of e+e−→π+π−J/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.
{{cite journal}}: Unknown parameter|coauthors=ignored (|author=suggested) (help) - ^ Swanson, E. (2013). "Viewpoint: New Particle Hints at Four-Quark Matter". Physics. 6: 69. doi:10.1103/Physics.6.69.
- ^ a b
Xiao, T.; Dobbs, S.; Tomaradze, A.; Seth, K. K. (2013). "Observation of the Charged Hadron Z±
c(3900) at √s = 4170 MeV". arXiv:1304.3036 [hep-ex]. - ^ "USTC Play a Role in Discovering New Subatomic Particle". University of Science and Technology of China. 6 April 2013.