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Kinetic Mixing and the Supersymmetric Gauge Hierarchy
Keith R. Dienes, Christopher Kolda, John March-Russell
The most general Lagrangian for a model with two U(1) gauge symmetries contains a renormalizable operator which mixes their gauge kinetic terms. Such kinetic mixing can be generate…
Low-Energy Signatures of Semi-perturbative Unification
Christopher Kolda, John March-Russell
We consider the low-energy signatures of, and high-energy motivations for, scenarios of semi-perturbative gauge coupling unification. Such scenarios can leave striking imprints on…
Realizing Higher-Level Gauge Symmetries in String Theory: New Embeddings for String GUTs
Keith R. Dienes, John March-Russell
We consider the methods by which higher-level and non-simply laced gauge symmetries can be realized in free-field heterotic string theory. We show that all such realizations have a…
Leptophobic U(1)'s and the R_b - R_c Crisis
K. S. Babu, Chris Kolda, John March-Russell
In this paper, we investigate the possibility of explaining both the R_b excess and the R_c deficit reported by the LEP experiments through Z-Z' mixing effects. We have constructed…