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I am working through some questions and I am stuck on the working of this one:

enter image description here

Where the working to the answer is here:

enter image description here

Can someone explain the highlighted section as I can't see where it comes from?

Qmechanic
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Σ baryon
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1 Answers1

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Here is the more explicit working I found for this question which is what I was interested in: enter image description here

Σ baryon
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