vbid/9783319673929

Description

This book develops two exciting areas of particle physics research. It applies the recent new insights�about the usefulness of helicity amplitudes in understanding gauge theory to the long-standing effort to understand theories with both electric and magnetic charges. It is known that for some�supersymmetric theories there is an exact duality that relates two descriptions of the physics, one where�the electric charges are weakly coupled and another where the electric charges are strongly coupled. The calculations in this thesis suggest that this duality can also hold in the low-energy limit of nonsupersymmetric�gauge theories. The idea of addressing the hierarchy problem of the standard model�Higgs mechanism using conformal symmetry is also explored. Analogously to �Little Higgs� models,�where divergences are cancelled only at one-loop order, models are studied that have infrared conformal�fixed points which related gauge and Yukawa couplings, allowing for a cancellation between seemingly�unrelated quantum loop diagrams.Typham this is the title: Dualities, Helicity Amplitudes, and Little Conformal Symmetry