I suspect these particles exist, but are extremely short-lived, even compared to other unstable, exotic particles...
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1Not color neutral. So they will be canceled. – MadMax Jul 13 '20 at 21:42
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1Possible duplicates: https://physics.stackexchange.com/q/219710/2451 and links therein. – Qmechanic Jul 13 '20 at 21:46
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Besides 'color neutrality', I've heard about the importance of 'antisymmetry' and 'singlet representation' in making a stable (or at least semi-stable) composite quark particle... – Kurt Hikes Jul 13 '20 at 21:58