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| http://www.particleadventure.org/images/page-elements/standard-chart.jpg |
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| http://www.particleadventure.org/images/page-elements/standard-chart.jpg |
There are three generations of
particles - three generations of lepton
pairs and three generations of quark
pairs. The higher generation particles
have more mass and tend to decay into lower
generation particles [²]. Typically,
we only observe the first generation
particles; we do not know why the natural
world has/needs the other two generations,
or why there appears to be three generations
in total [²].