J/psi meson 
(jāsī, -psī)
(jāsī, -psī)n.
An electrically neutral meson containing a charm quark and a charm antiquark having a mass about 6,060 times that of the electron and a mean lifetime of approximately 7.2 × 10-21 second.
| 单词 | J/psi meson |
| 释义 | J/psi meson (jāsī, -psī)n. An electrically neutral meson containing a charm quark and a charm antiquark having a mass about 6,060 times that of the electron and a mean lifetime of approximately 7.2 × 10-21 second. |
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