Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-10-23
Physics
High Energy Physics
High Energy Physics - Phenomenology
43 pages, 1 figure; V3: small corrections and clarifications, references added
Scientific paper
A simple explanation of the flavor hierarchies can arise if matter fields interact with a conformal sector and different generations have different anomalous dimensions under the CFT. However, in the original study by Nelson and Strassler many supersymmetric models of this type were considered to be 'incalculable' because the R-charges were not sufficiently constrained by the superpotential. We point out that nearly all such models are calculable with the use of a-maximization. Utilizing this, we construct the simplest vector-like flavor models and discuss their viability. A significant constraint on these models comes from requiring that the visible gauge couplings remain perturbative throughout the conformal window needed to generate the hierarchies. However, we find that there is a small class of simple flavor models that can evade this bound.
Poland David
Simmons-Duffin David
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