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Jul14-10, 08:12 AM
P: 7
This is due to color confinement... The color forces don't let a color-charged particle to live "isolated"... A proton has a neutral color charge, and the mesons all have a neutral color charge, as they are formed by a colored quark, and it's anticolor. (e.g. red + antired).

(Btw it's not a stupid question!) ;-)