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Ex-14.8
The reaction can be rewritten as follows U1+U--->S+S1. which implies that U and U1 annihiliate creating S and S1
The pi+ has the quark composition Ud1.Since no quarks are present in the final state. One possible way to get rid of the quarks is to change U into d
U--->d+W(+). Hence the remaining processes are d+d(+)--->energy and
W(+)--->u(+) and vu.
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