Search for the Invisibly Decaying Higgs Particle at LEP and the LHC

The Higgs particle can have dominantly invisible decay in a large class of Majoron models as well as some SUSY models. The LEP signal and mass limit for a Higgs particle undergoing invisible decay are explored. They are found to be very similar to those for the standard model decay. The best signatures and discovery limit for an invisibly decaying Higgs particle at the LHC are also discussed. (Invited Talk at the XXIXth Rencontres de Moriond on QCD and High Energy Hadronic Interactions, M\'eribel, France, 19--26 March 1994.)Comment: 5 Pages + 3 figures available on request, CERN-TH.7221/9

Solar Neutrino Oscillation - An Overview

After a brief summary of the neutrino oscillation formalism and the solar neutrino sources and experiments I discuss the matter effect on solar neutrino oscillation. Then I discuss how the resulting alternative solutions are experimentally resolved in favour of the LMA solution, with particular exphasis on the SK, SNO and KL data.Comment: 13 pages Latex plus 10 eps figures, Plenary Talk at the Xth International Symposium on Particles, Strings and Cosmology (PASCOS), Boston, 16-22 August 2004; one figure and a few numbers update