Possible Decay of Omega Minus Particle?

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Homework Statement


As you can see this decay is said to be possible

2pzbv60.jpg

The Attempt at a Solution



but i don't get it because isn't charge conservation violated ?
omega minus --> Q=-1
Xi--> Q=0
negative pion -- > Q=-1/3
 
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A negative pion has charge -1.
It consists of the quarks down and anti-up.
 
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The last problem I posted on QM made it into advanced homework help, that is why I am putting it here. I am sorry for any hassle imposed on the moderators by myself. Part (a) is quite easy. We get $$\sigma_1 = 2\lambda, \mathbf{v}_1 = \begin{pmatrix} 0 \\ 0 \\ 1 \end{pmatrix} \sigma_2 = \lambda, \mathbf{v}_2 = \begin{pmatrix} 1/\sqrt{2} \\ 1/\sqrt{2} \\ 0 \end{pmatrix} \sigma_3 = -\lambda, \mathbf{v}_3 = \begin{pmatrix} 1/\sqrt{2} \\ -1/\sqrt{2} \\ 0 \end{pmatrix} $$ There are two ways...
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