TIFR Annual Report 2003-04 THEORETICAL PHYSICS High Energy Physics Highlights

If neutrinos from a supernova pass through the Earth before reaching the detector, their energy spectra were shown to allow identification of their mixing scenarios. Precise values of the solar neutrino mass and mixing parameters were determined from a global data analysis. The difference between the survival probabilities of muon neutrino and antineutrino beams at long baselines, was shown to probe the deviation from maximality of muon neutrino flavour mixing. In a nonminimal supergravity model the lightest supersymmetric particle was found to be the superpartner of the Higgs instead of a gauge boson, with very distinctive implications for dark matter experiments. Implications of an R-parity violating supersymmetric model, with an ultralight gravitino as the lightest supersymmetric particle, for the Large Hadron Collider were studied. The first computation of next-to-leading order QCD corrections to a process involving virtual graviton exchange in models of TeV-scale gravity was completed.