These lectures were recorded the past month of June during the 2008 LNF Spring Institute, that was held in the Frascati National Laboratories (Rome). Professor M. Peskin kindly consented to reproduce his lectures in the Physics Institute of the University of Antioquia.
The third lecture on Supersymmetry (August 5) was not recorded properly, and will be presented by Prof. E. Nardi relying on Prof. Peskin slides.

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