2002/07/31 by Francesca Borzumati, Jae Sik Lee · 5 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1103/physrevd.66.115012
published as Phys.Rev. D66 (2002) 115012 · 19 pages, 4 figures, and 2 tables. Version to appear in Phys. Rev. D
arxiv created 2002/11/26 · openalex publication_date 2002/12/31 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We reanalyze the constraints imposed on lepton-number violating interactions by radiative contributions to neutrino masses at the one- and two-loop levels in supersymmetric models without R parity. The interactions considered are the \ensuremathΔL=1 superpotential operators \ensuremathλijkLiLjEkc and \ensuremathλijk^\ensuremath'LiQjDkc, and the \ensuremathΔL=1 soft terms AijkLiLjEkc and Aijk^\ensuremath'LiQjDkc. The two-loop contributions analyzed are those induced by the radiatively generated mass splitting between the CP-even and CP-odd sneutrino states. It is shown how the constraints on the couplings \ensuremathλijk and \ensuremathλijk^\ensuremath' coming from the one-loop analysis can be evaded. In such a case, the two-loop contributions to neutrino masses become important. The combined one- and two-loop analysis yields constraints on the couplings \ensuremathλi33 and \ensuremathλi33^\ensuremath' that are rather difficult to escape. The two-loop analysis yields also constraints on Ai33 and Ai33^\ensuremath', which are not bounded at the one-loop level. More freedom remains for the couplings \ensuremathλijk, \ensuremathλijk^\ensuremath', and Aijk, Aijk^\ensuremath', when j and k are first- or second-generation indices.