Take for examples question 1c see the solution here

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Unformatted text preview: , the addition of these gluons does not affect the order of the interaction. Take for examples Question 1c) (see the solution): here you need an EM interaction to annihilate the e+ e− and produce one of the qq pairs in the final state (say the ss ). The other qq pairs in the final state can be made from gluons. So this process is lowest ­order in the EM interaction. The marker was, I think, a little too forgiving of the question 1 issues. I have not changed any grades, however, sinc...
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