Equation Icon  ∫ ′ μναβ ′ 4-π 2 μναβ -d4p--------eip(x−x)θ(−-p2)------- ℋ (x,x ) = 45 G ℱx (2π)4 || ||2. (145 ) (p2)2 |1 + 4π Gp2 H&tidle;(p; ¯μ2)|