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Why don't Hadrons ever form from quarks of all the same charge? For instance you never see 2 or 3 up quarks together with no down quarks or vice-versa.

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They do form, but don’t last long. Delta baryons can have three up quarks (for the $\Delta^{++}$) or three down quarks (for the $\Delta^-$). These baryons are unstable and last only a few trillionths of a trillionth of a second.

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  • $\begingroup$ Not sure I'd count something that can only exist for such a short time to be truly formed. $\endgroup$ – Derek Seabrooke Nov 11 at 1:17
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    $\begingroup$ In my book, if it has been given a name and had its lifetime measured, it “formed”. In terms of Planck units, this is practically an eternity. $\endgroup$ – G. Smith Nov 11 at 1:18
  • $\begingroup$ What are "planck units"? $\endgroup$ – Derek Seabrooke Nov 11 at 1:21
  • $\begingroup$ By the way, the Omega baryon with three strange quarks lasts a trillion times longer! $\endgroup$ – G. Smith Nov 11 at 1:22
  • $\begingroup$ Planck units are the natural units for theories of relativistic quantum gravity, formed by setting $c$, $\hbar$, and $G$ to $1$. $\endgroup$ – G. Smith Nov 11 at 1:23

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