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The first charmed particle (a particle containing a charm quark) to be discovered was the J/ψ meson.
The experiment covered studies on electron pair production, on e μ events as a signature for charmed particles, and on very high transverse momentum π0 production in pp reactions.
Although charm quarks are not extremely common, they can be found in particles created by particle accelerators (which smash atoms together at extremely high speeds), such as J/ψ mesons, D mesons, and other charmed particles.