D particle
Americannoun
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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.
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See Table at subatomic particle
Etymology
Origin of D particle
First recorded in 1975–80
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