ar X iv : h ep - t h / 04 12 28 6 v 2 2 4 D ec 2 00 4 Realizations of observables in Hamiltonian systems with first class constraints

ar X iv : h ep - t h / 03 12 24 0 v 1 1 9 D ec 2 00 3 New realizations of observables in dynamical systems with second class constraints

New realizations of observables in dynamical systems with second class constraints. Abstract In the Dirac bracket approach to dynamical systems with second class constrains the observables are represented by elements of a quotient Dirac bracket algebra. We describe the constraints which allow to construct families of new realizations of this algebra. The realizations are obtained as quotients o...

ar X iv : h ep - p h / 04 12 32 6 v 1 2 2 D ec 2 00 4 Issues in the Extraction of m s and V us from Hadronic τ Decay Data

ar X iv : h ep - p h / 04 12 36 2 v 1 2 3 D ec 2 00 4 Small x evolution : BFKL vs Dipole Picture

The relation between the two approaches is discussed both in the linear and nonlinear regimes. It is connected to the gauge invariance and Möbius symmetry in LL perturbative QCD. First corrections beyond the large Nc approximation are discussed for the nonlinear case.

ar X iv : h ep - p h / 04 02 09 2 v 1 9 F eb 2 00 4 Precision Electroweak Constraints and the Mixed Radion - Higgs Sector ∗

Adding radion perturbations (up to second order) to the static (RS) metric allows us to calculate the general first and second order interactions of the radion field with the electroweak vector bosons. We use these interactions to compute precision electroweak observables in the case of Higgs-radion mixing and compare with experiment.

ar X iv : h ep - t h / 03 10 04 6 v 2 2 3 D ec 2 00 3 Boundary Action of N = 2 Super - Liouville Theory

We derive a boundary action of N = 2 super-Liouville theory which preserves both N = 2 supersymmetry and conformal symmetry by imposing explicitly T = T and G = G. The resulting boundary action shows a new duality symmetry.