Bottom quark
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The bottom quark, beauty quark, or b quark, is an elementary particle of the third generation. It is a heavy quark with a charge of −1/3 e. Wikipedia
Weight: 4.19 GeV
Composition: elementary particle
Decays into: charm quark or; up quark
Discovered: Leon M. Lederman et al. (1977)
Family: quark
Generation: third
Interactions: strong, weak, electromagnetic, gravity