Zc(3900) - Wikipedia, the free encyclopedia:
"The Zc(3900) is a subatomic particle, a hadron that is believed to be either the first tetraquark or hadron molecule that has been observed experimentally. The discovery was made in 2013 by two independent research groups: one part of the Belle experiment group at the Japanese KEK particle physics laboratory, the other using the BES III detector at the Beijing Electron Positron Collider.[1][2][3][4]
The Zc(3900) is a decay product of the previously observed anomalous Y(4260) particle.[5] The Zc(3900) in turn decays into a charged pion and J/ψ, which is consistent with it containing four or more quarks.[4]
Researchers are expected to run decay experiments this year to determine its nature with more precision."
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