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Now, I arrived at equation (B.8) and I have problem with getting equation (B.12).

[tex]F(x_\alpha,x_\beta)=\dfrac{1}{(1-x_\alpha)(1-x_\beta)}(\dfrac{7x_\alpha x_\beta}{4}-1)+\dfrac{x_\alpha^2lnx_\alpha}{(x_\beta-x_\alpha)(1-x_\alpha)^2}(1-2x_\beta+\dfrac{x_\alpha x_\beta}{4})+\dfrac{x_\beta^2lnx_\beta}{(x_\alpha-x_\beta)(1-x_\beta)^2}(1-2x_\alpha+\dfrac{x_\alpha x_\beta}{4})[/tex]

I got a lot of terms with high order of m

_{W}(m

_{W}

^{2}, m

_{W}

^{4}, m

_{W}

^{6}, ...) while there is no m

_{W}term in the book.

I checked the integral over Feynman parameter twice.