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Down quark

The down quark is a type of elementary particle, and a major constituent of matter. The down quark is the second-lightest of all quarks, and combines with other quarks to form composite particles called hadrons. Wikipedia
Mass: 4.7+0.5; −0.3 MeV/c2
Composition: elementary particle
Discovered: SLAC (1968)
Electric charge: −1/3 e
Family: quark
Spin: 1/2 ħ
Symbol: d