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

Charged Higgs Boson Search at the LHC

This review starts with a brief introduction to the charged Higgs boson $(H^\pm)$ in the Minimal Supersymmetric Standard Model (MSSM). It then discusses the prospects of a relatively light $H^\pm$ boson search via top quark decay and finally a heavy $H^\pm$ boson search at LHC. The viable channels for $H^\pm$ search are discussed, with particular emphasis on the $H^\pm -> tau+nu$ decay channel.Comment: 12 pages including 6 eps figs, Plenary talk at PASCOS'05, Gyeongju, Korea, June 200

The Charged Higgs Boson Search at LHC

This review starts with a brief introduction to the charged Higgs boson $(H^\pm)$ in the Minimal Supersymmetric Standard Model (MSSM). It then discusses the prospects of a relatively light $H^\pm$ boson search via top quark decay and finally a heavy $H^\pm$ boson search at LHC. The viable channels for $H^\pm$ search are discussed, with particular emphasis on the $H^\pm \to \tau \nu$ decay channel.Comment: 12 pages Latex including 6 figs; Invited Review Talk at the 2nd Intl Conf on Physics at LHC, Vienna, 13-17 July 200

Thermal suppression of phase separation in condensate mixtures

We examine the role of thermal fluctuations in binary condensate mixtures of dilute atomic gases. In particular, we use Hartree-Fock-Bogoliubov with Popov approximation to probe the impact of non-condensate atoms to the phenomenon of phase-separation in two-component Bose-Einstein condensates. We demonstrate that, in comparison to $T=0$, there is a suppression in the phase-separation of the binary condensates at $T\neq0$. This arises from the interaction of the condensate atoms with the thermal cloud. We also show that, when $T\neq0$ it is possible to distinguish the phase-separated case from miscible from the trends in the correlation function. However, this is not the case at $T=0$.Comment: 5 pages, 4 figure