Equation Icon  ∫ 4 [ || 2|| ] H (x;μ2) ≡ ---1-- -d-p-eipx ln |p-|− iπ signp0 θ(− p2) 480 π2 (2 π)4 |μ2| 1 ∫ d4p ( − (p0 + iε)2 + pip ) = -----2 lim ----4-eipx ln ---------2-------i . (110 ) 480 π ε→0+ (2π ) μ