Alternative to the seesaw mechanism

Physical Review D - Particles, Fields, Gravitation and Cosmology

Volumn 59, Issue 9, 1999, Pages 1-3

  Silva Marcos, J I ^a,b  

^a NIKHEF   (Netherlands)

^b INSTITUTO SUPERIOR TÉCNICO   (Portugal)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 17544381942     PISSN: 05562821     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevD.59.091301     Document Type: Article

References (11)

1. T. Yanagida, in Proceedings of the Workshop on Unified Theory and Baryon Number in the Universe, Tsukuba, Japan, 1979, edited by O. Sawada and A. Sugamoto (KEK Report No. 79-18, Tsukuba, 1979); M. Gell-Mann, P. Ramond, and R. Slansky, in Supergravity, Proceedings of the Workshop, Stony Brook, New York, 1979, edited by P. van Nieuwenhuizen and D. Freedman (North-Holland, Amsterdam, 1979).
2. T. Yanagida, in Proceedings of the Workshop on Unified Theory and Baryon Number in the Universe, Tsukuba, Japan, 1979, edited by O. Sawada and A. Sugamoto (KEK Report No. 79-18, Tsukuba, 1979); M. Gell-Mann, P. Ramond, and R. Slansky, in Supergravity, Proceedings of the Workshop, Stony Brook, New York, 1979, edited by P. van Nieuwenhuizen and D. Freedman (North-Holland, Amsterdam, 1979).
3. Recently, P. Hung constructed a model with 4 families, having also one massive fourth neutrino, but, where at tree level, all light neutrinos are massless; P. Hung, hep-ph/9810419.
4. G. C. Branco, J. I. Silva-Marcos, and M. N. Rebelo, Phys. Lett. B 237, 446 (1990); G. C. Branco and J. I. Silva-Marcos, ibid. 359, 166 (1995); G. C. Branco, D. Emmanuel-Costa, and J. I. Silva-Marcos, Phys. Rev. D 56, 107 (1997).
5. G. C. Branco, J. I. Silva-Marcos, and M. N. Rebelo, Phys. Lett. B 237, 446 (1990); G. C. Branco and J. I. Silva-Marcos, ibid. 359, 166 (1995); G. C. Branco, D. Emmanuel-Costa, and J. I. Silva-Marcos, Phys. Rev. D 56, 107 (1997).
6. G. C. Branco, J. I. Silva-Marcos, and M. N. Rebelo, Phys. Lett. B 237, 446 (1990); G. C. Branco and J. I. Silva-Marcos, ibid. 359, 166 (1995); G. C. Branco, D. Emmanuel-Costa, and J. I. Silva-Marcos, Phys. Rev. D 56, 107 (1997).
7. For other deviations from the democratic limit see J. I. Silva-Marcos, Phys. Lett. B 443, 276 (1998).
8. G. C. Branco, M. N. Rebelo, and J. I. Silva-Marcos, Phys. Lett. B 428, 136 (1998).
9. If one assumes that the neutrinos constitute the hot dark matter of the universe, having a mass a few eV, then one is lead to highly degenerate neutrinos. A systematic analysis of Majorana neutrino degeneracy was proposed by G. C. Branco, M. N. Rebelo, and J. I. Silva-Marcos, Phys. Rev. Lett. 82, 683 (1999).
10. In a forthcoming paper, we shall specify the mass ratio dependence of the phases.
11. The generalization of the mechanism here proposed, for more families, is straightforward.