Why isnt there a up,up anti-down baryon?

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There doesn't seem to be anything in the theory of the standard model that says such a baryon couldn't exist, so why don't we see it?
 
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Bobhawke said:
There doesn't seem to be anything in the theory of the standard model that says such a baryon couldn't exist

Yes there is. It's colored.
 
ok I feel stupid now.

Im going to go hit myself in the forehead
 
however, you're certainly right that QCD does not forbid many baryonic-like states (such as the pentaquark) that we (debatably) do not see. Why is that? Who knows...
 

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