CHARM FRACTIONAL CHARGES, “Up, charm, and top quarks (collectively referred to as up-type quarks) have a charge of + 2⁄3 e, while down, strange, and bottom quarks (down-type quarks) have − 1⁄3 e. The fractional charge of the quarks is an accident of the units we use to measure electric charge. If we used other units the quark charges would come out integers.”
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