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10 papers found.
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Parallel adaptive Monte Carlo integration with the event generator WHIZARD

We describe a new parallel approach to the evaluation of phase space for Monte-Carlo event generation, implemented within the framework of the Whizard package. The program realizes a twofold self-adaptive multi-channel parameterization of phase space and makes use of the standard OpenMP and MPI protocols for parallelization. The modern MPI3 feature of asynchronous communication...

New physics in multi-Higgs boson final states

We explore the potential for the discovery of the triple-Higgs signal in the decay channel at a 100 TeV hadron collider. We consider both the Standard Model and generic new-physics contributions, described by an effective Lagrangian that includes higher-dimensional operators. The selected subset of operators is motivated by composite-Higgs and Higgs-inflation models. In the...

Scattering of W and Z bosons at high-energy lepton colliders

We present a new study of quasi-elastic W and Z scattering processes in high-energy \(e^+e^-\) collisions, based on and extrapolating the low-energy effective theory which extends the standard model with a \(125\;\text {GeV}\) Higgs boson. We parameterize deviations in the low-energy range in terms of the dimension-eight operators that arise in the effective theory. Smoothly...

NLO QCD predictions for off-shell \( t\overline{t} \) and \( t\overline{t}H \) production and decay at a linear collider

We present predictions for \( t\overline{t} \) and \( t\overline{t}H \) production and decay at future lepton colliders including non-resonant and interference contributions up to next-to-leading order (NLO) in perturbative QCD. The obtained precision predictions are necessary for a future precise determination of the top-quark Yukawa coupling, and allow for top-quark...

Combining Pati-Salam and flavour symmetries

We construct an extension of the Standard Model (SM) which is based on grand unification with Pati-Salam symmetry. The setup is supplemented with the idea of spontaneous flavour symmetry breaking which is mediated through flavon fields with renormalizable couplings to new heavy fermions. While we argue that the new gauge bosons in this approach can be sufficiently heavy to be...

Flavour models with three Higgs generations

Florian Hartmann 0 Wolfgang Kilian 0 0 Department Physik , Univertity Siegen, 57068 Siegen, Germany We construct models with a spontaneously broken SU(3)F flavour symmetry where three generations

Multiple scales in Pati-Salam unification models

Florian Hartmann 0 Wolfgang Kilian 0 Karsten Schnitter 0 0 Department Physik, Universitat Siegen , 57068 Siegen, Germany We investigate models where gauge unification (GUT) proceeds in steps that

Configuration and Performance of a Mobile 129Xe Polarizer

Sergey E. Korchak 0 Wolfgang Kilian 0 Lorenz Mitschang 0 0 S. E. Korchak W. Kilian (&) L. Mitschang Physikalisch-Technische Bundesanstalt, Abbestr. 2-12, 10587 Berlin, Germany A stand-alone, self

An analytic initial-state parton shower

We present a new algorithm for an analytic parton shower. While the algorithm for the final-state shower has been known in the literature, the construction of an initialstate shower along these lines is new. The aim is to have a parton shower algorithm for which the full analytic form of the probability distribution for all branchings is known. For these parton shower algorithms...