How Can We Obtain a Large Majorana-Mass in Calabi-Yau Models ?

Details How Can We Obtain a Large Majorana-Mass in Calabi-Yau Models ? How Can We Obtain a Large Majorana-Mass in Calabi-Yau Models ?

1994-01-26

arxiv.org/abs/hep-ph/9401332v1

Prog.Theor.Phys. 92 (1994) 153-174

Physics

High Energy Physics

High Energy Physics - Phenomenology

30-pages + 6-figures, LaTeX, Preprint DPNU-94-02, AUE-01-94

Scientific paper

10.1143/PTP.92.153

In a certain type of Calabi-Yau superstring models it is clarified that the symmetry breaking occurs by stages at two large intermediate energy scales and that two large intermediate scales induce large Majorana-masses of right-handed neutrinos. Peculiar structure of the effective nonrenormalizable interactions is crucial in the models. In this scheme Majorana-masses possibly amount to $O(10^{9 \sim 10}\gev)$ and see-saw mechanism is at work for neutrinos. Based on this scheme we propose a viable model which explains the smallness of masses for three kind of neutrinos $\nu _e, \nu _{\mu} \ {\rm and}\ \nu _{\tau}$. Special forms of the nonrenormalizable interactions can be understood as a consequence of an appropriate discrete symmetry of the compactified manifold.

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