D particle

American  

noun

Physics.

1. D meson.

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D particle Scientific  

1. Either of two subatomic particles in the meson family, one neutral and one positively charged, having masses 3,649 and 3,658 times that of the electron and average lifetimes of 4.2 × 10 ^{- 13} and 1.1 × 10 ^{- 12} seconds, respectively.

2. See Table at subatomic particle

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Etymology

Origin of D particle

First recorded in 1975–80