释义 |
eta-c meson Related to eta-c meson: eta prime mesone·ta-c meson E0224550 (ā′tə-sē′, ē′tə-)n. An electrically neutral meson composed of a charm quark and a charm antiquark and having a mass 5,832 times that of the electron and a mean lifetime of about 2.6 × 10-23 second. |