Particle Physics and Cosmology: Second Tropical Workshop, San Juan, Puerto Rico 1-5 May 2000

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The Standard Model offers no fundamental explanation for the origin of the fermion mass and mixing parameters, except that they arise from Yukawa couplings, which are free parameters of the Model. The Workshop addresses various theoretical, phenomenological, and experimental issues concerning quark and lepton masses and mixings, which are central to solving the long-standing fermion mass problem. Following the trend of the First Tropical Workshop (AIP CP 444), the focus is again the presentation of the current status of the main accelerator and non-accelerator neutrino mass experiments, such as Super-Kamiokande, and SNO, the future experimental projects, e. g. , MINOS, and some of the phenomenology related to them. Also included are reviews of the theoretical and phenomenological ideas related to the tests of the direct CP violating effects that are expected to occur in both the K and the B meson systems, including discussions of future experimental projects.