Charged Higgs production with a top in MC@NLO

The production in association with a top quark is the most promising search channel for charged Higgs bosons at the LHC. We review its theoretical description including next-to-leading order corrections and the combination with a parton shower. The latter allows us to for the first time answer questions about the kinematics of all jets in the process. We then describe the consistent subtraction of intermediate states and present new results about the bottom mass uncertainty impacting the parton densisities.Comment: Proceedings `Prospects for Charged Higgs Discovery at Colliders', including new results on bottom mass induced uncertainty, on-shell subtraction, and reference cross section

W+Jets at CDF: Evidence for Top Quarks

Recently, an anomaly of W+jets events at large invariant masses has been reported by CDF. Many interpretations as physics beyond the Standard Model are being offered. We show how such an invariant mass peak can arise from a slight shift in the relative normalization of the top and WW backgrounds.Comment: 6pages, 6 figure

Production of Supersymmetric Particles at High-Energy Colliders

The production and decay of supersymmetric particles is presented. The dependence of the hadro-production cross section for weakly and strongly interacting yields an improvement of derived mass bounds or the measurement of the masses, respectively, of neutralinos/charginos and stops at the Tevatron and at the LHC. Moreover, the NLO corrections increase the predicted neutralino/chargino cross section by +20% to +40%, nearly independent of the mass of the particles. The consistent treatment as well as the phenomenological implications of scalar top mixing are presented. The correction to the stop production cross sections, depending on the fraction of incoming quarks and gluons, varies between -10% to +40% for an increasing fraction of incoming gluons. The dependence of this cross section on all parameters, except for the masses of the produced particles, is negligible.Comment: 86 pages, LaTeX, 69 figures included; Ph.D. Thesis postscript file also available from http://www.desy.de/~pleh