Renormalization group analysis of extended electroweak models from the heterotic string |
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| Affiliation: | 1. Department of Physics, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland;2. Swiss Federal Nuclear Safety Inspectorate ENSI, Industriestrasse 19, 5201 Brugg, Switzerland;3. German Aerospace Center (DLR), Institute of Aerospace Medicine, Linder Höhe, 51147 Köln, Germany;4. European Space Agency ESA, European Astronaut Centre EAC, Space Medicine HRE-OM, Cologne, Germany;1. Università di Roma Tor Vergata, Roma, Italy;2. INFN - Sezione di Roma Tor Vergata, Roma, Italy;3. Centro Fermi, Roma, Italy |
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| Abstract: | Extended electroweak models need new parameters (including new renormalization-induced gauge-mixing angles) to fix the gauge currents. We present the renormalization group predictions for these parameters in all heterotic string models with one extra, neutral, gauge boson at low energy. The possible matter contents, consistent with perturbative unification and low-energy physics, are determined for any model. |
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