B particle

American  

noun

Physics.

1. B meson.

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B particle Scientific  

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

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Etymology

Origin of B particle

First recorded in 1965–70