The discussion revolves around the question of why there are no nucleons composed of three up quarks (or three down quarks) with spin 1/2, despite the existence of Delta particles made from up and down quarks with spin 3/2. The scope includes theoretical considerations related to particle physics and quark composition.
Participants generally agree on the constraints imposed by Fermi statistics and color charge requirements, but there is some debate regarding the implications of these constraints and the nature of the wavefunctions involved.
The discussion highlights the complexities of quark combinations and the requirements for color neutrality, but does not resolve the underlying assumptions about the nature of wavefunctions or the implications for particle existence.
okey I see. This might be a really stupid question to you, but why can't we have a symmetric color wave function? The antisymmetric one isBill_K said:Can't satisfy the Fermi statistics. (1) Three up quarks means the isospin part of the wavefunction is totally symmetric. (2) Must have three different colors red, green, blue, so the color part is totally antisymmetric. Conclusion: the spin part (3) must be totally symmetric. That requires it to be spin 3/2.