1996/03/31 by K. S. Babu, Christopher Kolda, Chris Kolda +1 · 13 citations
Mathematics · Physics and Astronomy · #Algorithm #Computer science #Dark Matter and Cosmic Phenomena #Gauge (firearms) #Grand Unified Theory #Mathematical physics #Mathematics #Mixing (physics) #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Realization (probability) #Renormalization group #Standard Model (mathematical formulation) #Statistics #Supersymmetry #hep-ph
paper · pdf · doi:10.1103/physrevd.54.4635
published as Phys. Rev. D 54, 4635 (1996) · LaTeX, 26 pages, 5 embedded EPSF figures. Version to be published in Phys. Rev. D
arxiv created 1996/07/03 · openalex publication_date 1996/10/01 · openalex created_date 2016/06/24 · arxiv updated 2016/08/24 · openalex updated_date 2026/08/05
In this paper, we investigate the possibility of explaining both the Rb excess and the Rc deficit reported by the CERN LEP experiments through Z\ensuremath-Z^\ensuremath' mixing effects. We have constructed a set of models consistent with a restrictive set of principles: unification of the standard model (SM) gauge couplings, vector-like additional matter, and couplings which are both generation independent and leptophobic. These models are anomaly-free, perturbative up to the GUT scale, and contain realistic mass spectra. Out of this class of models, we find three explicit realizations which fit the LEP data to a far better extent than the unmodified SM or MSSM and satisfy all other phenomenological constraints which we have investigated. One realization, the \ensuremathη model coming from E6, is particularly attractive, arising naturally from geometrical compactifications of heterotic string theory. This conclusion depends crucially on the inclusion of a U(1) kinetic mixing term, whose value is correctly predicted by renormalization group running in the E6 model given one discrete choice of spectra.