B particle

noun

, Physics.

1. B meson.

B particle

1. Either of two subatomic particles in the meson family, one neutral and one positively charged, both of which have masses 10,331 times that of an electron and average lifetimes of 1.6 × 10 ^-12 seconds. B particles contain bottom quarks .
2. See Table at subatomic particle

Word History and Origins

Origin of B particle¹

First recorded in 1965–70