Recent content by bnado

Wierd. The latex code for the first formula is \int \frac{dk}{\sqrt{k^2+m^2}} e^{i k x - i \sqrt{k^2+m^2} t}+e^{i k x + i \sqrt{k^2+m^2} t} and it's just the integral that gives you the propagator in position space. the second one is just \delta (t-x)

Hello everybody. I have a free scalar in two dimensions. I know that its propagator will diverge for lightlike separations, that is t= ±x. I have to find the prefactor for this delta function, and I don't know how to do this. How do I see from, for example, \int \frac{dk}{\sqrt{k^2+m^2}} e^{i k...

I have the following process: two ingoing particles, a photon hitting a nucleus, and two outgoing particles, the nucleus and a pion. I have computed |M|2 and the differential cross section in the center of mass frame dσ/dΩCM; I now have to go into the lab frame, where the nucleus is initially at...