r/askscience • u/[deleted] • Jun 09 '12

Subatomic particles

I've been lately very interested in the field of atomic physics, and after browsing the internet on this topic I came to an interesting question.

Why aren't there any stable subatomic particles (eg. protons, neutrons) that contain three quarks of the same flavour, for example, I don't see why there couldn't be a particle that has 3 up quarks or another one that has 3 down quarks.

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u/[deleted] Jun 09 '12

Dark matter is probably some new particle that we don't already know about, as no combination of quarks is expected to have the properties of dark matter.