Zc(3900)

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]}

Z_c(3900)

Composition	Exotic meson
Status	On hold

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 (π^±) and a J/ψ 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 (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)