# Juergen Reuter - University of Freiburg

## Contact Details

NameJuergen Reuter |
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AffiliationUniversity of Freiburg |
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CityFreiburg im Breisgau |
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CountryGermany |
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## Pubs By Year |
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## External Links |
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## Pub CategoriesHigh Energy Physics - Phenomenology (15) High Energy Physics - Experiment (3) High Energy Physics - Theory (1) Physics - Accelerator Physics (1) Physics - Data Analysis; Statistics and Probability (1) |

## Publications Authored By Juergen Reuter

**Authors:**Keisuke Fujii

^{1}, Christophe Grojean

^{2}, Michael E. Peskin

^{3}, Tim Barklow

^{4}, Yuanning Gao

^{5}, Shinya Kanemura

^{6}, Hyungdo Kim

^{7}, Jenny List

^{8}, Mihoko Nojiri

^{9}, Maxim Perelstein

^{10}, Roman Poeschl

^{11}, Juergen Reuter

^{12}, Frank Simon

^{13}, Tomohiko Tanabe

^{14}, Jaehoon Yu

^{15}, James D. Wells

^{16}, Adam Falkowski

^{17}, Shigeki Matsumoto

^{18}, Takeo Moroi

^{19}, Francois Richard

^{20}, Junping Tian

^{21}, Marcel Vos

^{22}, Hiroshi Yokoya

^{23}, Hitoshi Murayama

^{24}, Hitoshi Yamamoto

^{25}

**Affiliations:**

^{1}LCC Physics Working Group,

^{2}LCC Physics Working Group,

^{3}LCC Physics Working Group,

^{4}LCC Physics Working Group,

^{5}LCC Physics Working Group,

^{6}LCC Physics Working Group,

^{7}LCC Physics Working Group,

^{8}LCC Physics Working Group,

^{9}LCC Physics Working Group,

^{10}LCC Physics Working Group,

^{11}LCC Physics Working Group,

^{12}LCC Physics Working Group,

^{13}LCC Physics Working Group,

^{14}LCC Physics Working Group,

^{15}LCC Physics Working Group,

^{16}LCC Physics Working Group,

^{17}LCC Physics Working Group,

^{18}LCC Physics Working Group,

^{19}LCC Physics Working Group,

^{20}LCC Physics Working Group,

^{21}LCC Physics Working Group,

^{22}LCC Physics Working Group,

^{23}LCC Physics Working Group,

^{24}LCC Physics Working Group,

^{25}LCC Physics Working Group

If the gamma-gamma resonance at 750 GeV suggested by 2015 LHC data turns out to be a real effect, what are the implications for the physics case and upgrade path of the International Linear Collider? Whether or not the resonance is confirmed, this question provides an interesting case study testing the robustness of the ILC physics case. In this note, we address this question with two points: (1) Almost all models proposed for the new 750 GeV particle require additional new particles with electroweak couplings. The key elements of the 500 GeV ILC physics program---precision measurements of the Higgs boson, the top quark, and 4-fermion interactions---will powerfully discriminate among these models. Read More

We summarize the physics case for the International Linear Collider (ILC). We review the key motivations for the ILC presented in the literature, updating the projected measurement uncertainties for the ILC experiments in accord with the expected schedule of operation of the accelerator and the results of the most recent simulation studies. Read More

Models with multi-scalar Higgs sectors inspired by a higher-dimensional setup are interesting alternatives to the Standard Model because, although they have a Higgs sector which gives mass to the W and Z gauge bosons as well as the SM fermions, this Higgs sector is potentially undiscoverable at the Large Hadron Collider or shows considerable deviations from the Standard Model Higgs sector. We investigate a compactified version of such models and study its phenomenology in the "golden" four-lepton channel at the LHC in areas of parameter space compatible with electroweak precision observables. Read More

This is a status report of the WHIZARD Monte Carlo multi-purpose event generator given at the LCFORUM 2012 at DESY. I review here the development of the WHIZARD generator version 2 with a special emphasis on linear collider physics. In case you use the program, please do cite the official reference(s). Read More

In this paper I review the calculations (and partially simulations and theoretical studies) that have been made and published during the last two to three years focusing on the electroweak symmetry breaking sector and the Higgs boson(s) within the Standard Model and models beyond the Standard Model (BSM) at or relevant for either the International Linear Collider (ILC) or the Compact Linear Collider (CLIC), commonly abbreviated as Linear Collider (LC). Read More

Grand Unified Theories often involve additional Abelian group factors apart from the standard model hypercharge, that generally lead to loop-induced mixing gauge kinetic terms. In this letter, we show that at the one-loop level this effect can be avoided in many cases by a suitable choice of basis in group space and present a general scheme for the construction of this basis. In supersymmetric theories however, a residual mixing in the soft SUSY breaking gaugino mass terms may appear. Read More

While Monte Carlo event generators like WHIZARD have become indispensable tools in studying the impact of new physics on collider observables over the last decades, the implementation of new models in such packages has remained a rather awkward and error-prone process. Recently, the FeynRules package was introduced which greatly simplifies this process by providing a single unified model format from which model implementations for many different Monte Carlo codes can be derived automatically. In this note, we present an interface which extends FeynRules to provide this functionality also for the WHIZARD package, thus making WHIZARD's strengths and performance easily available to model builders. Read More

In this talk we present the recent calculation of the NLO QCD corrections to the production of four b-quarks induced by initial state quarks at the CERN LHC. We describe the details of the calculation using the GOLEM approach for the virtual corrections and MadEvent/MadDipole for the real emission part and present some results. Read More

We propose a class of E6-based local orbifold Grand Unified Theories (GUTs) which yield an exceptional supersymmetric standard model as their low energy theory including leptoquark and unhiggs exotics and a Z' at the TeV scale. Unification is achieved in two steps through an intermediate scale symmetry breaking. Read More

The Next-To-Minimal-Supersymmetric extension of the Standard Model (NMSSM) has been in the focus of extensive studies in the past two decades. In anticipation of the LHC era, the interest in automatized tools that can calculate collider signatures has grown. We present the implementation of the NMSSM into the event generator WHIZARD. Read More

Grand Unified Theories based on an E6 gauge group embed all Higgs- and matter fields within one 27 dimensional fundamental representation. In addition each 27 contains a right handed neutrino, an NMSSM-like standard model singlet and a pair of exotic particles, that couple quarks to leptons. The extended particle content spoils simple gauge unification as in the MSSM. Read More

**Affiliations:**

^{1}University of Siegen,

^{2}University of Siegen,

^{3}University of Freiburg

**Category:**High Energy Physics - Phenomenology

A crucial test of the Standard Model is the measurement of electroweak gauge-boson scattering. In this paper, we describe a generic parameterization aimed at a realistic simulation of weak-boson scattering at the LHC. The parameterization implements resonances of all possible spin and isospin combinations, properly matched to the low-energy effective (chiral) Lagrangian, includes leading higher-order effects and contains a minimal unitarization scheme. Read More

In Little Higgs models, the Higgs mass is stabilized at the one-loop level by the mechanism of collective symmetry breaking. Typically, the basic ingredient of these models is a large(r) global symmetry group spontaneously broken at a scale of several TeV. The (light) Higgs appears as a Goldstone boson corresponding to a non-diagonal broken generator of this global symmetry. Read More

**Affiliations:**

^{1}Wuerzburg University,

^{2}Karlsruhe University

We study the cancellations among Feynman diagrams that implement the Ward and Slavnov-Taylor identities corresponding to the conserved supersymmetry current in supersymmetric quantum field theories. In particular, we show that the Faddeev-Popov ghosts of gauge- and supersymmetries never decouple from the physical fields, even for abelian gauge groups. The supersymmetric Slavnov-Taylor identities provide efficient consistency checks for automatized calculations and can verify the supersymmetry of Feynman rules and the numerical stability of phenomenological predictions simultaneously. Read More

**Affiliations:**

^{1}Univ. di Ferrara & INFN Ferrara,

^{2}TU Darmstadt,

^{3}TU Darmstadt

**Category:**High Energy Physics - Phenomenology

We sketch the architecture of O'Mega, a new optimizing compiler for tree amplitudes in quantum field theory, and briefly describe its usage. O'Mega generates the most efficient code currently available for scattering amplitudes for many polarized particles in the Standard Model and its extensions. Read More