This chapter focuses on the basic idea of gauge mediation. There are three sectors in the theory: a dynamical SUSY breaking sector, a messenger sector, and the MSSM. SUSY breaking is communicated to the messenger sector so that the messengers have a SUSY breaking spectrum. They also have SM gauge interactions, which then communicate SUSY breaking to the ordinary superpartners. This mechanism has the great advantage that since the gauge interactions are flavour-blind, it does not introduce FCNCs which are an enormous problem for supergravity mediation models. Exercises are provided at the end of the chapter.
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