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Scalar MSSM Higgs boson production via gluon fusion gg → h,H is mediated by heavy quark and squark loops. The higher order QCD corrections to these processes turn out to be large. The full supersymmetric QCD corrections have been calculated recently. In the limit of large SUSY masses a conceptual problem appears, i.e. the proper treatment of the large gluino mass limit. In this work we will des...

We describe the completed 8,192-node, 0.4Tflops machine at Columbia as well as the 12,288-node, 0.6Tflops machine assembled at the RIKEN Brookhaven Research Center. Present performance as well as our experience in commissioning these large machines is presented. We outline our on-going physics program and explain how the configuration of the machine is varied to support a wide range of lattice ...

We calculate the lower moments of the deep-inelastic structure functions of the pion and the rho meson on the lattice. Of particular interest to us are the spin-dependent structure functions of the rho. The calculations are done with Wilson fermions and for three values of the quark mass, so that we can perform an extrapolation to the chiral limit.

We report on the scaling of basic hadronic observables in lattice QCD with N f = 2 maximally twisted Wilson dynamical quarks. We give preliminary results for some of the Gasser–Leutwyler low energy constants, the chiral condensate and the average mass of u and d quarks.

An effective residual interaction for a meson-meson system is computed in lattice QCD. We describe the theoretical framework and present its application to the I = 2 channel S-wave interaction of the π–π system. Scattering phase shifts are also computed and compared to experimental results.

We provide a brief introduction to the high density effective theory of QCD. As an application, we consider the instanton correction to the perturbatively generated gap in the color superconducting phase. We show that the instanton correction becomes large for μ ∼ 1.25 GeV in Nf = 2 QCD, and for μ ∼ 750 MeV in Nf = 3 QCD with a massive strange quark. We also study some other numerical issues re...

With the help of M-theory configuration of N=1 supersymmetric QCD, we analyze the strong coupling moduli of N=1 theory and its relation with S-duality transformation in N=2 supersymmetric QCD. As a result we confirm that two type-IIA descriptions for N=1 supersymmetric QCD, one of them being strong coupling description and another being weak, correspond to a single M-theory description for N=1 ...

2-color QCD at finite temperature T and chemical potential μ is revisited in the strong coupling limit on the lattice. The phase structure in the space of T , μ and the quark mass m is elucidated with the use of the mean field approximation and the large dimensional expansion. We put special emphasis on the interplay among the chiral condensate, the diquark condensate and the quark density in t...

We derive a universality result for the fermionic contribution to the one loop vacuum polarisation in Lattice QCD. This leads in turn to a universality result for the fermionic contribution to the leading term in the weak coupling expansion of the Lattice QCD β-function. A general formula for the fermionic contribution to the ratio of lattice and continuum Λ-parameters is also obtained.