Particle Zoo

The Standard Model

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The Down Quark

Symbol: d
Group: fermion, quark
Rest mass: 0.00376 - 0.00644 u
Diameter: 0
Charge: -1/3 e
Mean lifetime: stable
Spin: 1/2
Generation: 1
The down is the second lightest quark and together with the up part of the protons and neutrons. This makes it an important particle of our matter. At the decay of a free neutron, a down turns into an up quark and an electron.



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