We assumed that the four gluino containing R-hadrons are the lightest hadrons which contain the LSP. The lighest among these is stable and the other three can deacy into it. Gluon-quark-quark bound state is not observed in nature. One asumption is that it is a repulsive channel in non-purturbative QCD and consequently unstable. On the other hand glueballs are observed and have a finite mass and...

We compare the standard top quark decay and the charged Higgs decay of the top quark, t → W b and t → H b, at the quantum level in the MSSM. While the SUSY loop corrections to the standard top quark decay are only of a few percent, it turns out that t → H b is a most promising candidate for carrying large quantum SUSY signatures. As a result, the (tanβ,MH±) exclusion plots presented by the CDF ...

We discuss strategies to determine hadronic decay couplings from lattice studies. As an application, we explore the decay of a vector meson to two pseudoscalar mesons with Nf = 2 flavours of sea quark. Although we are working with quark masses that do not allow a physical decay, we show how the transition rate can be evaluated from the amplitude for ρ→ ππ and from the annihilation component of ...

We present progress report of a CP-PACS calculation of quenched QCD spectrum with the Wilson quark action. Light hadron masses and meson decay constants are obtained at β =5.9, 6.1, and 6.25 on lattices with a physical extent of 3 fm, and for the range of quark mass corresponding to mπ/mρ ≈ 0.75 − 0.4. Nucleon mass at each β appears to be a convex function of quark mass, and consequently the va...

We present progress report of a CP-PACS calculation of quenched QCD spectrum with the Wilson quark action. Light hadron masses and meson decay constants are obtained at β =5.9, 6.1, and 6.25 on lattices with a physical extent of 3 fm, and for the range of quark mass corresponding to mπ/mρ ≈ 0.75 − 0.4. Nucleon mass at each β appears to be a convex function of quark mass, and consequently the va...

We present the calculation of the decay width of the Z-boson into three jets including complete quark mass effects to second order in the strong coupling constant. The study is done for different jet clustering algorithms such as EM, JADE, E and DURHAM. Because three-jet observables are very sensitive to the quark mass we consider the possibility of extracting the bottom quark mass from LEP dat...