After installing CalcHEP (see this post), oen should go to the working directory created by CalcHEP and running the program,
$ cd ~/Documents/WorkCalcHEP $ ./calchep
Then the CalcHEP shell will appear, and you can choose your model (in future posts I’ll tell you the easiest way to create and import models)
Once you have picked a model, you can enter a process
The list of particles in the model you have chosen is shown, and you can write the process you want to study. Note that diagrams with certain particles can be excluded, but in this example I didn’t.
CalcHEP can draw the Feynman diagrams of a certain (sub)process,
and after squaring the amplitude,
you can see the “squared Feynman diagrams” 🙂 Cool, Isn’t it?
In a future post I shall write about the numerical integration, or the possibility of exporting plots and Feynman diagrams to LaTeX 😀