A lot vs. Alot: 9 Grammatical Pitfalls
|psi particle |
See J/psi particle.
|psi' particle |
An electrically neutral meson having a mass 7,213 times that of the electron and a mean lifetime of approximately 1 × 10-20 seconds, composed, like the J/psi particle, of a charm-anticharm quark pair. See Table at subatomic particle.