Half-spin baryons with identicle quarks?

[bsaucer]

Do any 1/2 spin baryons exist that are made of three identical (flavored) quarks? I know the Δ-, Δ++ and Ω- have 3/2 spin. If the 1/2 spin versions of these particles can't exist, then why not?

 

[Jason Rong]

The color wave function is totally antisymmetric, the flavor is totally symmetric, so that the spin has to be totally symmetric.

 

[fzero]

Spin of a composite particle is best identified with the total angular momentum J = L + S, where L and S are the "orbital" and spin angular momentum of the constituents. There are indeed spin 1/2 versions of the $\Delta$ particles, which are in different orbital angular momentum states compared to the lightest $\Delta$. A list can be found here: http://pdglive.lbl.gov/listing.brl?fsizein=1&exp=Y&group=BXXX020 . The known $\Omega$ states are listed at http://pdglive.lbl.gov/listing.brl?fsizein=1&exp=Y&group=BXXX035 . It doesn't appear that their angular momentum has been well measured. Presumably they are too short-lived, or their decays too dirty to make this easy, but I am no experimentalist.