| 单词 | meson |
| 释义 | meson Any of a class of elementary particles that are a subclass of the hadrons. According to current quark theory mesons consist of quark-antiquark pairs. They exist with positive, negative, and zero charges, but when charged the charge has the same magnitude as that of the electron. They include the kaon , pion , and psi particles. Mesons are believed to participate in the forces that hold nucleons together in the nucleus. The muon, originally called a mu-meson, was thought to be a meson but is now recognized as a lepton |
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