Determining the heavy seesaw neutrino mass matrix from low-energy parameters

Abstract

We explore how the seesaw sector in neutrino mass models may be constrained through symmetries to be completely determined in terms of low-energy mass, mixing angle and CP-violating phase observables. The key ingredients are intra-family symmetries to determine the neutrino Dirac mass matrix in terms of the charged-lepton or quark mass matrices, together with inter-family or flavor symmetries to determine diagonalization matrices. Implications for leptogenesis and collider detection of heavy neutral leptons are discussed. We show that leptogenesis can succeed in small regions of parameter space for the case where the neutrino Dirac mass matrix equals the up-quark mass matrix. The model where the neutrino Dirac mass matrix equals the charged-lepton mass matrix can yield a heavy neutral lepton as light as about 1 TeV, but detecting such a particle will be difficult.

19 pages, 7 figures; v2: typos corrected, new ref. added; v3:added discussion and references, this version accepted by PRD

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Cited by in corpus (7)

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• Successful $N_2$ leptogenesis with flavour coupling effects in realistic unified models
• Supersymmetric $SO(10)$-inspired leptogenesis and a new $N_2$-dominated scenario
• Improved analysis of the bounds from the electroweak precision tests on the 4-site model
• Leptogenesis and LHC Physics with Type III See-Saw
• Beyond the Standard Model with leptogenesis and neutrino data