Question: Draw the lowest-order quark diagrams for the processes: (a) e + + e K + + K , (b) J/

Draw the lowest-order quark diagrams for the processes:

(a) e+ + e− → K+ + K−, 

(b) J/ψ → μ+ + μ−,

(c) J/ψ → ηc + γ.

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