Seesaw Neutrinos from the Heterotic String
- Deutsches Elektronen-Synchrotron DESY, 22603 Hamburg (Germany)
- Department of Physics, University of Tokyo, Tokyo 113-0033 (Japan)
- CERN, Theory Division, CH-1211 Geneva 23 (Switzerland)
- Physikalisches Institut der Universitaet Bonn, Nussallee 12, 53115 Bonn (Germany)
- Physik Department T30, Technische Universitaet Muenchen, James-Franck-Strasse, 85748 Garching (Germany)
We study the possibility of realizing the neutrino seesaw mechanism in the E{sub 8}xE{sub 8} heterotic string. In particular, we consider its Z{sub 6} orbifold compactifications leading to the supersymmetric standard model gauge group and matter content. We find that these models possess all the necessary ingredients for the seesaw mechanism, including the required Dirac Yukawa couplings and large Majorana mass terms. We argue that this situation is quite common in heterotic orbifolds. In contrast with the conventional seesaw of grand unified theories (GUTs), no large GUT representations are needed to generate the Majorana mass terms. The total number of right-handed neutrinos can be very large, up to O(100)
- OSTI ID:
- 20957868
- Journal Information:
- Physical Review Letters, Vol. 99, Issue 2; Other Information: DOI: 10.1103/PhysRevLett.99.021601; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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