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    Stuck on Problem 6.2 in Peskin's QFT Book?

    Homework Statement In fact this is not homework, I'm self-studying QFT by reading Peskin's book, and I'm stuck with Problem 6.2.Homework Equations In part (e), I cannot get the factor (1+(1-x)2)/x in the cross section.The Attempt at a Solution Maybe I'd already been wrong in earlier parts, the...