Marco Roncadelli

TL;DR: In this paper, the Weinberg-Salam model was extended to include neutrino masses in the most economical way and two new particles, a Goldstone boson and a neutral Higgs with low mass, appeared coupled strongly to neutrinos but so weakly to the other fermions that they cannot be detected at present laboratory energies.

TL;DR: In this article, the existence of a massless boson coupled to left-handed neutrinos was analyzed and the effect of neutrino-neutrino collisions and light boson bremsstrahlung on lepton number nonconservation was investigated.

TL;DR: In this paper, the authors discuss the possibility of generating small Dirac neutrino masses in a natural way, and give a mechanism based on symmetry arguments which works in the SU(2) × U(1) and SU(5) models, but fails in left-right symmetric theories.

TL;DR: In this paper, experimental and theoretical constraints which can prevent the introduction of horizontal gauge ssymmetries were studied, and it was shown that horizontal interactions are only allowed if the symmetry breakdown introduces a large Majorana mass for the neutrinos.

TL;DR: In this paper, it was shown that neutrinos heavier than about 10 keV decay sufficiently fast into 3 ν e, as to avoid cosmological and astrophysical bounds which restrict stable Neutrinos to have masses below 50eV.