Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-10-07
Phys.Rev.D78:113001,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 7 figures; v2: typos corrected, new ref. added; v3:added discussion and references, this version accepted by PRD
Scientific paper
10.1103/PhysRevD.78.113001
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.
He Xiao-Gang
Law Sandy S. C.
Volkas Raymond R.
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