In a toy theory Alma-m) ond Blmg=0) are two spinless partices and the vertex Ps giver in the fiquire. The potides and their anti particles are iderticol. O Drow the lowest order Feynman d'agrams for AA > AA scattufy ☺ Calculate the scatteing anpli tude Mi for each d'agran ond the tatal ample- tude M=IiMi (use vetex foetos as-ig and propagators as 1B A
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