Frank Krauss

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We review the physics basis, main features and use of general-purpose Monte Carlo event generators for the simulation of proton-proton collisions at the Large Hadron Collider. Topics included are: the generation of hardscattering matrix elements for processes of interest, at both leading and nextto-leading QCD perturbative order; their matching to(More)
We derive an improved prescription for the merging of matrix elements with parton showers, extending the CKKW approach. A flavour-dependent phase space separation criterion is proposed. We show that this new method preserves the logarithmic accuracy of the shower, and that the original proposal can be derived from it. One of the main requirements for the(More)
In this publication the construction of an automatic algorithm to subtract infrared divergences in real QCD corrections through the Catani-Seymour dipole subtraction method [1] is reported. The resulting computer code has been implemented in the matrix element generator AMEGIC++ [2]. This will allow for the automatic generation of dipole subtraction terms(More)
We compare different procedures for combining fixed-order tree-level matrix element generators with parton showers. We use the case of W-production at the Tevatron and the LHC to compare different implementations of the socalled CKKW scheme and one based on the so-called MLM scheme using different matrix element generators and different parton cascades. We(More)
The new multipurpose event-generation framework SHERPA, acronym for Simulation for High-Energy Reactions of PArticles, is presented. It is entirely written in the object-oriented programming language C++. In its current form, it is able to completely simulate electron–positron and unresolved photon–photon collisions at high energies. Also, fully hadronic(More)
During growth on l-cysteine ethylester, Chlorella fusca (211-8b) accumulated a substance which contained bound sulfide, which could be liberated by reduction with dithioerythritol (DTE) as inorganic sulfide. This substance was extracted with hot methanol and purified by thin layer chromatography. This substance liberated free sulfide when incubated with(More)
An oxidoreductase with an extremely broad substrate specificity reducing reversibly 2-oxocarboxylates at the expense of reduced artificial redox mediators to (2R)-hydroxycarboxylates has been purified to a specific activity of up to 1800 for the reduction of phenylpyruvate. The membrane-bound non-pyridine nucleotide-dependent enzyme appears(More)
In this paper total cross sections for signals and backgrounds of topand Higgs-production channels in ee collisions at a future linear collider are presented. All channels considered are characterized by the emergence of six-particle final states. The calculation takes into account the full set of tree-level amplitudes in each process. Two multi-purpose(More)
We present a new approach to combine multiple NLO parton-level calculations matched to parton showers into a single inclusive event sample. The method provides a description of hard multi-jet configurations at next-to leading order in the perturbative expansion of QCD, and it is supplemented with the all-orders resummed modelling of jet fragmentation(More)