| 释义 |
D meson
D mesonn. Either of two mesons, one neutral and one positively charged, containing a charm quark and having masses 3,649 and 3,658 times that of an electron and mean lifetimes of about 4.2 × 10-13 and 1.04 × 10-12 second, respectively.D meson
D meson[¦dē ′mā‚sän] (particle physics) Collective name for four charmed mesons that form two isotopic spin douplets, have masses of approximately 1865 MeV, and are pseudoscalar particles. |