U(1)' coupling constant at low energies from heterotic orbifolds

Abstract

Additional Abelian gauge interactions are generic to string compactifications. In heterotic string models, gauge coupling unification of such forces and other gauge interactions is natural due to their common origin. In this letter we study systematically the 1-loop running of the coupling constants in effective vacua emerging from Z8 heterotic orbifold compactifications that provide the matter spectrum of the MSSM plus some vectorlike exotics, restricting to vacua that yield a non-anomalous U(1)' symmetry, gauge coupling unification and the observed values of known gauge couplings. We determine the low-energy value of the U(1)' coupling constant for different scales of supersymmetry breakdown. We find that the U(1)' coupling constant is quite restricted in string models to lie in the range 0.46-0.7 for low-scale supersymmetry or 0.44-0.6 in other cases. We argue that the phenomenology of these string vacua should be further explored to solve some extant issues, such as the stability of the Higgs vacuum.

19 pages, 4 figures, 4 tables; v2: matches version published in PLB

References in corpus (19)

• A Mini-Landscape of Exact MSSM Spectra in Heterotic Orbifolds
• Search for new high-mass phenomena in the dilepton final state using 36 fb${}^{-1}$ of proton-proton collision data at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Search for additional heavy neutral Higgs and gauge bosons in the ditau final state produced in 36 fb${}^{-1}$ of $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• The Heterotic Road to the MSSM with R parity
• Family non-universal Z' models with protected flavor-changing interactions
• Discrete R symmetries for the MSSM and its singlet extensions
• Lepton flavor violating Z' explanation of the muon anomalous magnetic moment
• Supersymmetric Standard Model from the Heterotic String (II)
• Axial Dark Matter: the case for an invisible Z'
• A study of electroweak vacuum metastability with a singlet scalar dark matter
• Non-supersymmetric heterotic model building
• Low Energy Supersymmetry from the Heterotic Landscape
• On Moduli Stabilisation and de Sitter Vacua in MSSM Heterotic Orbifolds
• A Novel String Derived Z' With Stable Proton, Light-Neutrinos and R-parity violation
• Moduli stabilization and SUSY breaking in heterotic orbifold string models
• Stabilizing the Higgs potential with a Z${}^{\prime }$
• A Light Z' Heterotic-String Derived Model
• Grand Unification in the Heterotic Brane World
• Z' Bosons from E(6): Collider and Electroweak Constraints