One-loop threshold effects in string unification |
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| Institution: | 1. Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;2. MPA/CINT/Lujan Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;3. Department of Physics and Astronomy, Brigham Young University Provo, UT 84602, USA;4. Theoretical Division, Los Alamos National Laboratory Los Alamos, NM 87545, USA;5. Department of Chemical Engineering, University of California Davis, Davis, CA 95616, USA;1. Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan;2. Mathematical Institute, University of Oxford, Andrew Wiles Building, Radcliffe Observatory Quarter, Woodstock Road, Oxford, OX2 6GG, UK;3. Massachusetts Institute of Technology, Department of Mathematics, 77 Massachusetts Avenue Cambridge, MA 02139, United States of America;1. Departamento de Física Teórica and Instituto de Física Teórica UAM-CSIC, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain;2. Jefferson Physical Laboratory, Harvard University, Cambridge, MA 02138, USA;1. Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany |
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| Abstract: | Like grand unification of old, string unification predicts simple tree-level relations between the couplings of all unbroken gauge groups such as SU(3)C or SU(2)W. I show here how to compute one-loop corrections to these relations for any four-dimensional model based on a classical vacuum of the heterotic string. The result can be used to calculate both sin2θWand ΛQCD in terms of αQCD and MPlanck. |
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