CERN Accelerating science

Article
Report number	hep-ph/0703078 ; CERN-PH-TH-2007-050 ; DESY-07-030 ; TUM-HEP-660-07 ; CERN-PH-TH-2007-050 ; DESY-07-030 ; TUM-HEP-660-07 ; DESY-2007-030
Title	Seesaw Neutrinos from the Heterotic String
Related title	NEUTRINO
Author(s)	Buchmuller, Wilfried (DESY) ; Hamaguchi, Koichi (Tokyo U.) ; Lebedev, Oleg (CERN) ; Ramos-Sanchez, Saul (Bonn U.) ; Ratz, Michael (Munich, Tech. U.)
Affiliation	(CERN)
Publication	2007
Imprint	7 Mar 2007
Number of pages	4
In:	Phys. Rev. Lett. 99 (2007) 021601
DOI	10.1103/PhysRevLett.99.021601
Subject category	Particle Physics - Phenomenology
Abstract	We study the possibility of realizing the neutrino seesaw mechanism in the E8XE8 heterotic string. In particular, we consider its Z_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 to 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).

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