What is the full Lagrangian of Standard Model?How can we build a Lagrangian that satisfies both the symmetry SU(3) and the symmetry SU(2) at the same time?
I'm not sure but I think they're referring to X and Y bosons. But hey...they're part of a GUT! and as far as I know, no GUT is part of SM yet!What do X,Y stand for?
I know what you mean by that pain but I can agree about having that pain only when you're talking about someone who actually claims to know QFT and SM well. I never claimed such a thing. I just gave the OP a picture of the SM's Lagrangian and when he asked about X and Y, I said I'm not sure! So I see no reason for you to feel that pain!Second, it pains me to say that Shyan doesn't really know what he's talking about with the X and Y. These have nothing to do with GUTs. These are so-called "Popov Ghosts" and are an unnecessary complication at this level.
Shyan said:So either I'm wrong in the first sentence, or I'm wrong in the last sentence, or I'm wrong in thinking that picture shows the SM's Lagrangian.
From your first post, it is very clear that you have no knowledge about ordinary QFT let alone supersymmetric QFT. In order to benefit from PF, I suggest that you ask questions that match your level of understanding. Otherwise, you will be wasting your and other people time.I have heard that almost SUGRA theories is not renormalizable(I am reading SUSY but not still SUGRA),then why do we still investigate SUGRA theories?