(a) Draw Feynman diagram and write down the amplitude (M) for ete +ptu. (mention the appropriate...

 

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(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. (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.