J particle

j-particle的词性：
n.（名词）

1. A neutral meson having an unusually large mass (about 6,060 times the mass of an electron) and a long lifetime (about 10^-20 second). Also called psi particle See table at subatomic particle
J粒子：一种中性介子，质量异常大（约为电子质量的6,060倍），寿命长（约为10^-20秒） 也作 psi particle参见 subatomic particle