Higgs plus 2 Jet Produktion in Gluonfusion

In dieser Arbeit wird untersucht, in wie fern der Prozess der Higgs + 2 Jet Produktion in Gluonfusion in Anwesenheit von Untergründen am LHC beobachtbar ist. Dazu werden Signal- zu Untergrund-Studien für drei unterschiedliche Szenarien vorgestellt. Des Weiteren wird untersucht, welche Rückschlüsse auf die Struktur der Higgskopplungen mit Hilfe dieses Prozesses gezogen werden können. Dies geschieht an Hand einer speziellen Observablen, dem Azimutalwinkel zwischen den beiden Jets

Studies for a Photon Collider at the ILC

One option at the International Linear Collider is to convert the electron beams into high energy photon beams by Compton scattering a few millimetres in front of the interaction region. Selected physics channels for this option have been analysed and technical issues have been studied. So far no showstoppers for this option have been found.Comment: V2: Minor changes, accepted by NI

Monte Carlo studies of the jet activity in Higgs + 2 jet events

Tree-level studies have shown in the past that kinematical correlations between the two jets in Higgs+2-jet events are direct probes of the Higgs couplings, e.g. of their CP nature. In this paper we explore the impact of higher-order corrections on the azimuthal angle correlation of the two leading jets and on the rapidity distribution of extra jets. Our study includes matrix-element and shower MC effects, for the two leading sources of Higgs plus two jet events at the CERN LHC, namely vector-boson and gluon fusion. We show that the discriminating features present in the previous leading-order matrix element studies survive.Comment: 12 pages, 10 figures. Version to appear on JHEP. Figs. 5-8 replaced with colour version

Studies on Chargino production and decay at a photon collider

A Monte-Carlo analysis on production and decay of supersymmetric charginos at a future photon-collider is presented. A photon collider offers the possibility of a direct branching-ratio measurement. In this study, the process γγ → ˜χ + 1 ˜χ − 1 → W + W − ˜χ 0 1 ˜χ0 1 → q¯qq¯q˜χ0 1 ˜χ0 1 has been considered for a specific mSUGRA scenario. Various backgrounds and a parameterised detector simulation have been included. Depending on the centre-of-mass energy, a statistical error for the directly measurable branching ratio BR(˜χ ± 1 → ˜χ0 1 W ± ) of up to 3.5% can be reached.