Recent content by Jodahr

Hello everyone, I have a question about virtual corrections of an external fermion line. According to the LSZ reduction formula and what some other people say, we neglect the self energies of external legs and multiply the wavefunction therefor just with a squareroot of the wave function...

Hello everybody, I have a short question about the renormalization scale. For dimensional regularization we introduce a scale μ with mass dimension to preserve the correct mass-dimension for the coupling and so on so that it is independent of the value of d = 4-2ε. But why can that μ have any...

Thanks a lot... but I think in the paper I have read they have used the integrated luminosity...because they have used exactly the dimension "inverse barn"...

hm?...I wanted to get a cross section limit for monojet signals...and I always found only the luminosity and the events...and event has no dimension..luminosity is inverse barn and XS is barn..so..if I really only need those paramaters..then it's trivial...I thought maybe I also need sth else...

ah..lol..I think it's just...events = sigma * luminosity...right?

Hello, How can I convert the number of events + the luminosity in a cross section? I think this must be trivial... thanks..

I have a question about Feynman Diagrams: let's say we have a process: up antidown -> W+ -> up antidown... the first vertex is like V_CKM G PL ( mixing, gamma, projector) the second is the same..only with the complex conjugate CKM matrix... but why?... If I compute the M* I have to...