Single and double seesaw for quark-lepton and neutrino masses

Details Single and double seesaw for quark-lepton and neutrino masses Single and double seesaw for quark-lepton and neutrino masses

2003-12-07

arxiv.org/abs/hep-ph/0312098v1

J.Korean Phys.Soc. 45 (2004) S230-S231

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex. Invited talk in ICFP-2003, Seoul, Korea, Oct 6-11, 2003. To appear in proceedings

Scientific paper

A left-right model of quarks and leptons based on the gauge group $SU(3)_c \times SU(2)_L \times SU(2)_R \times U(1)_{B-L}$ is studied. Here the scalar sector consists of only two doublets namely (1,2,1,1) and (1,1,2,1) but familiar bidoublet (1,2,2,0) is removed. Quarks and charged leptons get mass from a single see-saw mechanism but neutrinos get mass from a double see-saw mechanism. In this type of models the heaviest right handed neutrino can be of order $10^{13}$ GeVs or less in a natural way, depending on the size of related Yukawa couplings.

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