2006/10/24 by Alon E. Faraggi, A.E. Faraggi, Elisa Manno +3 · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Heterotic string theory #Higgs boson #Higgs field #Minimal Supersymmetric Standard Model #Moduli #Observable #Orbifold #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Standard Model (mathematical formulation) #String (physics) #hep-ph #hep-th
paper · pdf · doi:10.1140/epjc/s10052-007-0243-5
published as Eur.Phys.J.C50:701-710,2007 · 20 pages, LaTeX; added references
arxiv created 2006/10/24 · openalex publication_date 2007/03/05 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Three generation heterotic-string vacua in the free fermionic formulation gave rise to models with solely the MSSM states in the observable Standard Model charged sector. The relation of these models to Z2 x Z2 orbifold compactifications dictates that they produce three pairs of untwisted Higgs multiplets. The reduction to one pair relies on the analysis of supersymmetric flat directions, that give superheavy mass to the dispensable Higgs states. We explore the removal of the extra Higgs representations by using the free fermion boundary conditions and hence directly at the string level, rather than in the effective low energy field theory. We present a general mechanism that achieves this reduction by using asymmetric boundary conditions between the left- and right-moving internal fermions. We incorporate this mechanism in explicit string models containing three twisted generations and a single untwisted Higgs doublet pair. We further demonstrate that an additional effect of the asymmetric boundary conditions is to substantially reduce the supersymmetric moduli space.