Monte Carlo Generators for the LHC

The status of two Monte Carlo generators, HELAC-PHEGAS, a program for multi-jet processes and VBFNLO, a parton level program for vector boson fusion processes at NLO QCD, is briefly presented. The aim of these tools is the simulation of events within the Standard Model at current and future high energy experiments, in particular the LHC. Some results related to the production of multi-jet final states at the LHC are also shown.Comment: 8 pages, 8 figures. Presented at the XXXI International Conference of Theoretical Physics, Matter To The Deepest: Recent Developments In Physics of Fundamental Interactions, Ustron, 5-11 September 2007, Polan

The method to determine the CP nature of Higgs bosons from decays to tau leptons at LC

We demonstrate how the transverse tau tau spin correlations can be used to determine whether a decaying Higgs boson is a mixed CP eigenstate, thereby directly probe the presence of CP violation in the neutral Higgs boson sector. We investigate the subsequent decay chain H --> tau+ tau- --> rho+ nu rho- nu --> pi+ pi0 nu pi- pi0 nu. The prospects for the measurement of the pseudoscalar admixture in the H-tau-tau coupling to a Standard Model Higgs boson with a mass of 120 GeV are quantified for the case of e+e- collisions at 350 GeV center-of-mass energy and 1 ab^{-1} integrated luminosity. The Standard Model Higgsstrahlung production process is used as an example.Comment: 9 pages, 4 figure, Presented at the XXVII International Conference of Theoretical Physics, Matter To The Deepest, Ustron, Poland, 15-21 September 200