Omega baryon

Ω -

The Ω - baryon, and Omega - baryon, is a relatively long-lived hadron, which belongs to the group of baryons.

The particle was formed in 1961 predicted on the basis of theoretical considerations and demonstrated experimentally in 1964 at Brookhaven National Laboratory in a bubble chamber. With its sss configuration, it is so far the only known particle ( i.e. not the first elementary family belonging ) of three heavy quarks of the same flavors there. His strangeness -3 therefore.

Production and decay

• Kaon -minus (us ) proton ( uud) → Omega -minus (sss ) kaon -Plus (us ) kaon - zero ( ds)
• Omega - minus ( sss) → Xi - zero ( uss ) Pi -Minus (ud )
• Xi - zero ( uss ) → Lambda ( uds ) Pi zero ( uu dd)

Apparent violation of the Pauli principle

The particles (sss ) presented before the introduction of color charge, similar to the - ( uuu ) and the particles ( ddd ), a violation of the Pauli principle dar. It is for all three particles are members of the Baryonendekupletts with a spin of 3 / 2 Since quarks are fermions with spin 1 /2, the spins of the three quarks must be parallel, so that the vector sum of 3/2 results. This in turn means that the quarks are the same in all quantum numbers. One can also say that their eigenfunctions are symmetric. The Pauli exclusion principle says but for fermions requires just an anti - symmetric wave function.

The problem was solved by postulated an additional internal degree of freedom for quarks, the color charge. This means that the quarks differ again in at least one quantum number, and their wave functions are again anti- symmetric.