CP Violation in Hyperon Decays

The theory and phenomenology of CP violation in hyperon decays is summarized.Comment: 11 pages, Latex format, 1 figure. Invited talk at the Third International Conference on B Physics and CP Violation, National Taiwan Univ., Taipei, Taiwan, Dec. 3-7, 1999; to be published in the Proceeding

CPT and Lorentz Violations in Neutrino Oscillations

Tests of Lorentz invariance violation and CPT Violation in neutrino oscillations are discussed. The sensitivity of current and future experiments is presented.Comment: References added and typos corrected, 8 pages, 1 figure, latex209. Presented at the Second Meeting on CPT and Lorentz Symmetry CPT'01, August 15-18, 2001, Bloomington, Indian

Neutrino Properties Before and After KamLAND

We review neutrino oscillation physics, including the determination of mass splittings and mixings from current solar, atmospheric, reactor and accelerator neutrino data. A brief discussion is given of cosmological and astrophysical implications. Non-oscillation phenomena such as neutrinoless double beta decay would, if discovered, probe the absolute scale of neutrino mass and also reveal their Majorana nature. Non-oscillation descriptions in terms of spin-flavor precession (SFP) and non-standard neutrino interactions (NSI) currently provide an excellent fit of the solar data. However they are at odds with the first results from the KamLAND experiment which imply that, despite their theoretical interest, non-standard mechanisms can only play a sub-leading role in the solar neutrino anomaly. Accepting the LMA-MSW solution, one can use the current solar neutrino data to place important restrictions on non-standard neutrino properties, such as neutrino magnetic moments. Both solar and atmospheric neutrino data can also be used to place constraints on neutrino instability as well as the more exotic possibility of $CPT$ and Lorentz Violation. Weillustrate the potential of future data from experiments such as KamLAND, Borexino and the upcoming neutrino factories in constraining non-standard neutrino properties.Comment: Invited contribution to a special issue of the Proceedings of the Indian National Academy of Sciences on "Neutrinos", 66 pages, 30 figs, latex, corrected some typos and ref