- #1

- 28

- 1

[tex] S_{x_1'x_2'... , x_1 x_2}^C = \int d^3p_1' d^3p_2'...d^3p_1d^3p_2...S_{p_1'p_2'... , p_1 p_2}^C \times e^{i p_1' . x_1'}... [/tex]

(i.e the fourier of the connected part of the corresponding S matrix element) vanishes when the distance between any two particles (states) is great.

He says that this only happens when this matrix element contains precisely

**one single delta function that ensures 3-momentum conservation:**

[tex] S_{p_1'p_2'... , p_1 p_2}^C = \delta^3(p_1'+p_2'+... - p_1 - p_2)\times \delta(energy \ conservation) \times C_{p_1'p_2'... , p_1 p_2} [/tex]

Can somebody tell my how this makes the first equation vanish when the relative distance of some states is large?

PD: sorry for the poor explanation but Im not gonna explain it better than Weinberg, Im just pointing out where Im having troubles.