Showing papers by "Wolfgang Kilian published in 2015"
TL;DR: In this article, an extension of the parameter-free $K$-matrix unitarization prescription is proposed, which is referred to as direct $T$-measure unitarisation.
Abstract: Weak vector-boson $W,Z$ scattering at high energy probes the Higgs sector and is most sensitive to any new physics associated with electroweak symmetry breaking. We show that in the presence of the 125 GeV Higgs boson, a conventional effective-theory analysis fails for this class of processes. We propose to extrapolate the effective-theory ansatz by an extension of the parameter-free $K$-matrix unitarization prescription, which we denote as direct $T$-matrix unitarization. We generalize this prescription to arbitrary nonperturbative models and describe the implementation as an asymptotically consistent reference model matched to the low-energy effective theory. We present exemplary numerical results for full six-fermion processes at the LHC.
84 citations
Posted Content•
TL;DR: In this article, the current status of NLO QCD automation in the Monte Carlo event generator WHIZARD is discussed for the explicit study of off-shell top quark production with associated backgrounds at a lepton collider.
Abstract: We briefly discuss the current status of NLO QCD automation in the Monte Carlo event generator WHIZARD. The functionality is presented for the explicit study of off-shell top quark production with associated backgrounds at a lepton collider.
19 citations
Posted Content•
TL;DR: In this paper, the POWHEG scheme was used to match radiative corrections consistently with the parton shower in two linear collider processes, $e^+e^-\,\to\,t\bar{t}
Abstract: Building on the new automatic subtraction of NLO amplitudes in WHIZARD, we present our implementation of the POWHEG scheme to match radiative corrections consistently with the parton shower. We apply this general framework to two linear collider processes, $e^+e^-\,\to\,t\bar{t}$ and $e^+e^-\,\to\,t\bar{t}H$.
6 citations
Journal Article•
TL;DR: In this article, the authors summarize the top physics setup in the event generator Whizard with a main focus on lepton colliders, including full six-, eight and ten-fermion processes, factorized processes and spin correlations.
Abstract: In this talk we summarize the top physics setup in the event generator Whizard with a main focus on lepton colliders. This includes full six-, eightand ten-fermion processes, factorized processes and spin correlations. For lepton colliders, QCD NLO processes for top quark physics are available and will be discussed. A special focus is on the top-quark pair threshold, where a special implementation combines a non-relativistic effective-field theory calculation augmented by a next-to-leading threshold logarithm resummation with a continuum relativistic fixed-order QCD NLO simulation.
3 citations
22 May 2015
TL;DR: In this paper, the authors describe the multi-purpose Monte-Carlo event generator WHIZARD for the simulation of high-energy particle physics experiments, including the support of the most accurate simulation of the collider environments at hadron colliders and especially at future linear lepton colliders.
Abstract: We describe the multi-purpose Monte-Carlo event generator WHIZARD for the simulation of high-energy particle physics experiments. Besides the presentation of the general features of the program like SM physics, BSM physics, and QCD effects, special emphasis will be given to the support of the most accurate simulation of the collider environments at hadron colliders and especially at future linear lepton colliders. On the more technical side, the very recent code refactoring towards a completely object-oriented software package to improve maintainability, flexibility and code development will be discussed. Finally, we present ongoing work and future plans regarding higher-order corrections, more general model support including the setup to search for new physics in vector boson scattering at the LHC, as well as several lines of performance improvements.
3 citations