Draw the Feynman diagrams for the gluon exchanges for the following couples of vertices: (a) R q

Question:

Draw the Feynman diagrams for the gluon exchanges for the following couples of vertices: 

(a) Rq → Bq, Bq → Rq; 

(b) Rq→Bq, q→q; 

(c) Rq→Rq, q→q. Specify which gluon (s) is (are) exchanged and the colour charges at both vertices. 

(d) Explain the meanings of the signs of the results.

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