Novel constraints on ΔL=1 interactions from neutrino masses

Francesca Borzumati, Jae Sik Lee

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

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 ΔL=1 superpotential operators λ ijkLiLjEkc and λijk′LiQjDk c, and the ΔL=1 soft terms Aijkijkc and A ijk′L̃ijkc. 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 λijk and λijk′ 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 λi33 and λ i33′ that are rather difficult to escape. The two-loop analysis yields also constraints on Ai33 and Ai33′, which are not bounded at the one-loop level. More freedom remains for the couplings λijk, λijk′, and Aijk, Aijk′, when j and k are first- or second-generation indices.

Original languageEnglish
Article number115012
JournalPhysical Review D
Volume66
Issue number11
DOIs
Publication statusPublished - 2002

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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