I'm studying the analogies between U(1) Higgs model and superconductivity BCS and GL theories. The question arises when Cooper pairs seem to be the responsible of the effective mass of the photon (I mean: no superconductivity, no cooper pairs, no photon's effective mass). Cooper pairs are a composite particle, so by analogy, Higgs boson might be. I found some ''old'' models (before Higgs boson discovery) but I'm an undergraduate student and I don't understand many things, but I think some of those models are now discarded. So nowadays, which is the state of composite Higgs models?
I said 'nowadays'. As I said, I'm undergraduate, I'm starting in this field, I don't understand much the articles. I don't want details, I want to know what hypothesis are still plausible and some information about them.