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Article
Report number	hep-th/9805133 ; CERN-TH-98-154 ; UPR-0784-T ; IEM-FT-173-98 ; UPR-784-T ; CERN-TH-98-154 ; IEM-FT-173
Title	Flat directions in three-generation free-fermionic string models
Author(s)	Cleaver, Gerald (Pennsylvania U.) ; Cvetic, Mirjam (Pennsylvania U.) ; Espinosa, Jose R. (CERN ; Pennsylvania U.) ; Everett, Lisa L. (Pennsylvania U.) ; Langacker, Paul (Pennsylvania U.)
Affiliation	(Univ. Pennsylvania Philadelphia)
Publication	1999
Imprint	22 May 1998
Number of pages	59
Note	59 pages Report-no: UPR-0784-T
In:	Nucl. Phys. B 545 (1999) 47-97
DOI	10.1016/S0550-3213(98)00863-3
Subject category	Particle Physics - Theory
Abstract	In quasi-realistic string models that contain an anomalous U(1) the non-zero Fayet-Iliopoulos term triggers the shifting of the original vacuum to a new one along some flat direction, so that SUSY is preserved but the gauge group is partially broken. The phenomenological study of these models thus requires as a first step the mapping of the space of flat directions. We investigate F- and D-flat directions in several three-generation SU(3)_C x SU(2)_L x U(1)_Y free-fermionic string models and discuss the typical scenarios that generically arise. When they exist, we systematically construct the flat directions that preserve hypercharge, only break Abelian group factors, and can be proven to remain F-flat to all orders in the non-renormalizable superpotential.
Copyright/License	Copyright @ unknown. Published by Elsevier B.V.

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