'ZC''', Zc, or zC may refer to:
- Zangger Committee, a committee on nuclear proliferation
- Zettacoulomb, an SI unit of electric charge
- Zeptocoulomb, another SI unit of electric charge
- In set theory, the name for a system with Zermelo's first five axioms plus the axiom of choice
- In mathematics, Zadoff–Chu sequence, a certain complex-valued sequence with the CAZAC property ( constant amplitude zero autocorrelation waveform)
- Honda D engine, an engine variant produced by Honda Motor Company
The Z(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. .
The Z(3900) is a decay product of the previously observed anomalous Y(4260) particle.
The neutral Z(3900) was observed by BESIII in 2015. It decays into a neutral pion and a J/ψ meson.
Researchers are expected to run decay experiments this year to determine its nature with more precision.