Question: (a) Draw Feynman diagram and write down the amplitude (M) for ete +ptu. (mention the appropriate polarisation vector or spinor in the diagram) (b)

(a) Draw Feynman diagram and write down the amplitude (M) for ete

(a) Draw Feynman diagram and write down the amplitude (M) for ete +ptu. (mention the appropriate polarisation vector or spinor in the diagram) (b) Calculate M2 considering all polarisation states and express in terms of Man- delstam variables using required calculations.

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