# J. Reuter - Karlsruhe University

## Contact Details

NameJ. Reuter |
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AffiliationKarlsruhe University |
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CityKarlsruhe |
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CountryGermany |
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## Pubs By Year |
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## Pub CategoriesHigh Energy Physics - Phenomenology (46) High Energy Physics - Experiment (26) High Energy Physics - Theory (7) Physics - Computational Physics (2) Mathematical Physics (1) Physics - Data Analysis; Statistics and Probability (1) Mathematics - Mathematical Physics (1) Physics - Accelerator Physics (1) Quantum Physics (1) Computer Science - Mathematical Software (1) Mathematics - Algebraic Geometry (1) |

## Publications Authored By J. Reuter

We discuss top-quark physics at the ILC with a focus on the full off-shell processes for $t\bar{t}$ and $t\bar{t}H$ production, including top-quark decays and also leptonic $W$ decays. A special focus is on the matching of the resummed vNRQCD threshold calculation and the fixed-order NLO QCD continuum calculation, where we present an update on the validation of the matching. All of the calculations have been performed in the \wz event generator framework. Read More

This document provides a writeup of contributions to the FCC-ee mini-workshop on "Physics behind precision" held at CERN, on 2-3 February 2016. Read More

**Authors:**Keisuke Fujii, Christophe Grojean, Michael E. Peskin, Tim Barklow, Yuanning Gao, Shinya Kanemura, Hyungdo Kim, Jenny List, Mihoko Nojiri, Maxim Perelstein, Roman Pöschl, Jürgen Reuter, Frank Simon, Tomohiko Tanabe, James D. Wells, Jaehoon Yu, Howard Baer, Mikael Berggren, Sven Heinemeyer, Suvi-Leena Lehtinen, Junping Tian, Graham Wilson, Jacqueline Yan, Hitoshi Murayama, James Brau

This paper addresses the question of whether the International Linear Collider has the capability of discovering new particles that have not already been discovered at the CERN Large Hadron Collider. We summarize the various paths to discovery offered by the ILC, and discuss them in the context of three different scenarios: 1. LHC does not discover any new particles, 2. Read More

**Authors:**D. de Florian

^{1}, C. Grojean

^{2}, F. Maltoni

^{3}, C. Mariotti

^{4}, A. Nikitenko

^{5}, M. Pieri

^{6}, P. Savard

^{7}, M. Schumacher

^{8}, R. Tanaka

^{9}, R. Aggleton

^{10}, M. Ahmad

^{11}, B. Allanach

^{12}, C. Anastasiou

^{13}, W. Astill

^{14}, S. Badger

^{15}, M. Badziak

^{16}, J. Baglio

^{17}, E. Bagnaschi

^{18}, A. Ballestrero

^{19}, A. Banfi

^{20}, D. Barducci

^{21}, M. Beckingham

^{22}, C. Becot

^{23}, G. Bélanger

^{24}, J. Bellm

^{25}, N. Belyaev

^{26}, F. U. Bernlochner

^{27}, C. Beskidt

^{28}, A. Biekötter

^{29}, F. Bishara

^{30}, W. Bizon

^{31}, N. E. Bomark

^{32}, M. Bonvini

^{33}, S. Borowka

^{34}, V. Bortolotto

^{35}, S. Boselli

^{36}, F. J. Botella

^{37}, R. Boughezal

^{38}, G. C. Branco

^{39}, J. Brehmer

^{40}, L. Brenner

^{41}, S. Bressler

^{42}, I. Brivio

^{43}, A. Broggio

^{44}, H. Brun

^{45}, G. Buchalla

^{46}, C. D. Burgard

^{47}, A. Calandri

^{48}, L. Caminada

^{49}, R. Caminal Armadans

^{50}, F. Campanario

^{51}, J. Campbell

^{52}, F. Caola

^{53}, C. M. Carloni Calame

^{54}, S. Carrazza

^{55}, A. Carvalho

^{56}, M. Casolino

^{57}, O. Cata

^{58}, A. Celis

^{59}, F. Cerutti

^{60}, N. Chanon

^{61}, M. Chen

^{62}, X. Chen

^{63}, B. Chokoufé Nejad

^{64}, N. Christensen

^{65}, M. Ciuchini

^{66}, R. Contino

^{67}, T. Corbett

^{68}, R. Costa

^{69}, D. Curtin

^{70}, M. Dall'Osso

^{71}, A. David

^{72}, S. Dawson

^{73}, J. de Blas

^{74}, W. de Boer

^{75}, P. de Castro Manzano

^{76}, C. Degrande

^{77}, R. L. Delgado

^{78}, F. Demartin

^{79}, A. Denner

^{80}, B. Di Micco

^{81}, R. Di Nardo

^{82}, S. Dittmaier

^{83}, A. Dobado

^{84}, T. Dorigo

^{85}, F. A. Dreyer

^{86}, M. Dührssen

^{87}, C. Duhr

^{88}, F. Dulat

^{89}, K. Ecker

^{90}, K. Ellis

^{91}, U. Ellwanger

^{92}, C. Englert

^{93}, D. Espriu

^{94}, A. Falkowski

^{95}, L. Fayard

^{96}, R. Feger

^{97}, G. Ferrera

^{98}, A. Ferroglia

^{99}, N. Fidanza

^{100}, T. Figy

^{101}, M. Flechl

^{102}, D. Fontes

^{103}, S. Forte

^{104}, P. Francavilla

^{105}, E. Franco

^{106}, R. Frederix

^{107}, A. Freitas

^{108}, F. F. Freitas

^{109}, F. Frensch

^{110}, S. Frixione

^{111}, B. Fuks

^{112}, E. Furlan

^{113}, S. Gadatsch

^{114}, J. Gao

^{115}, Y. Gao

^{116}, M. V. Garzelli

^{117}, T. Gehrmann

^{118}, R. Gerosa

^{119}, M. Ghezzi

^{120}, D. Ghosh

^{121}, S. Gieseke

^{122}, D. Gillberg

^{123}, G. F. Giudice

^{124}, E. W. N. Glover

^{125}, F. Goertz

^{126}, D. Gonçalves

^{127}, J. Gonzalez-Fraile

^{128}, M. Gorbahn

^{129}, S. Gori

^{130}, C. A. Gottardo

^{131}, M. Gouzevitch

^{132}, P. Govoni

^{133}, D. Gray

^{134}, M. Grazzini

^{135}, N. Greiner

^{136}, A. Greljo

^{137}, J. Grigo

^{138}, A. V. Gritsan

^{139}, R. Gröber

^{140}, S. Guindon

^{141}, H. E. Haber

^{142}, C. Han

^{143}, T. Han

^{144}, R. Harlander

^{145}, M. A. Harrendorf

^{146}, H. B. Hartanto

^{147}, C. Hays

^{148}, S. Heinemeyer

^{149}, G. Heinrich

^{150}, M. Herrero

^{151}, F. Herzog

^{152}, B. Hespel

^{153}, V. Hirschi

^{154}, S. Hoeche

^{155}, S. Honeywell

^{156}, S. J. Huber

^{157}, C. Hugonie

^{158}, J. Huston

^{159}, A. Ilnicka

^{160}, G. Isidori

^{161}, B. Jäger

^{162}, M. Jaquier

^{163}, S. P. Jones

^{164}, A. Juste

^{165}, S. Kallweit

^{166}, A. Kaluza

^{167}, A. Kardos

^{168}, A. Karlberg

^{169}, Z. Kassabov

^{170}, N. Kauer

^{171}, D. I. Kazakov

^{172}, M. Kerner

^{173}, W. Kilian

^{174}, F. Kling

^{175}, K. Köneke

^{176}, R. Kogler

^{177}, R. Konoplich

^{178}, S. Kortner

^{179}, S. Kraml

^{180}, C. Krause

^{181}, F. Krauss

^{182}, M. Krawczyk

^{183}, A. Kulesza

^{184}, S. Kuttimalai

^{185}, R. Lane

^{186}, A. Lazopoulos

^{187}, G. Lee

^{188}, P. Lenzi

^{189}, I. M. Lewis

^{190}, Y. Li

^{191}, S. Liebler

^{192}, J. Lindert

^{193}, X. Liu

^{194}, Z. Liu

^{195}, F. J. Llanes-Estrada

^{196}, H. E. Logan

^{197}, D. Lopez-Val

^{198}, I. Low

^{199}, G. Luisoni

^{200}, P. Maierhöfer

^{201}, E. Maina

^{202}, B. Mansoulié

^{203}, H. Mantler

^{204}, M. Mantoani

^{205}, A. C. Marini

^{206}, V. I. Martinez Outschoorn

^{207}, S. Marzani

^{208}, D. Marzocca

^{209}, A. Massironi

^{210}, K. Mawatari

^{211}, J. Mazzitelli

^{212}, A. McCarn

^{213}, B. Mellado

^{214}, K. Melnikov

^{215}, S. B. Menari

^{216}, L. Merlo

^{217}, C. Meyer

^{218}, P. Milenovic

^{219}, K. Mimasu

^{220}, S. Mishima

^{221}, B. Mistlberger

^{222}, S. -O. Moch

^{223}, A. Mohammadi

^{224}, P. F. Monni

^{225}, G. Montagna

^{226}, M. Moreno Llácer

^{227}, N. Moretti

^{228}, S. Moretti

^{229}, L. Motyka

^{230}, A. Mück

^{231}, M. Mühlleitner

^{232}, S. Munir

^{233}, P. Musella

^{234}, P. Nadolsky

^{235}, D. Napoletano

^{236}, M. Nebot

^{237}, C. Neu

^{238}, M. Neubert

^{239}, R. Nevzorov

^{240}, O. Nicrosini

^{241}, J. Nielsen

^{242}, K. Nikolopoulos

^{243}, J. M. No

^{244}, C. O'Brien

^{245}, T. Ohl

^{246}, C. Oleari

^{247}, T. Orimoto

^{248}, D. Pagani

^{249}, C. E. Pandini

^{250}, A. Papaefstathiou

^{251}, A. S. Papanastasiou

^{252}, G. Passarino

^{253}, B. D. Pecjak

^{254}, M. Pelliccioni

^{255}, G. Perez

^{256}, L. Perrozzi

^{257}, F. Petriello

^{258}, G. Petrucciani

^{259}, E. Pianori

^{260}, F. Piccinini

^{261}, M. Pierini

^{262}, A. Pilkington

^{263}, S. Plätzer

^{264}, T. Plehn

^{265}, R. Podskubka

^{266}, C. T. Potter

^{267}, S. Pozzorini

^{268}, K. Prokofiev

^{269}, A. Pukhov

^{270}, I. Puljak

^{271}, M. Queitsch-Maitland

^{272}, J. Quevillon

^{273}, D. Rathlev

^{274}, M. Rauch

^{275}, E. Re

^{276}, M. N. Rebelo

^{277}, D. Rebuzzi

^{278}, L. Reina

^{279}, C. Reuschle

^{280}, J. Reuter

^{281}, M. Riembau

^{282}, F. Riva

^{283}, A. Rizzi

^{284}, T. Robens

^{285}, R. Röntsch

^{286}, J. Rojo

^{287}, J. C. Romão

^{288}, N. Rompotis

^{289}, J. Roskes

^{290}, R. Roth

^{291}, G. P. Salam

^{292}, R. Salerno

^{293}, M. O. P. Sampaio

^{294}, R. Santos

^{295}, V. Sanz

^{296}, J. J. Sanz-Cillero

^{297}, H. Sargsyan

^{298}, U. Sarica

^{299}, P. Schichtel

^{300}, J. Schlenk

^{301}, T. Schmidt

^{302}, C. Schmitt

^{303}, M. Schönherr

^{304}, U. Schubert

^{305}, M. Schulze

^{306}, S. Sekula

^{307}, M. Sekulla

^{308}, E. Shabalina

^{309}, H. S. Shao

^{310}, J. Shelton

^{311}, C. H. Shepherd-Themistocleous

^{312}, S. Y. Shim

^{313}, F. Siegert

^{314}, A. Signer

^{315}, J. P. Silva

^{316}, L. Silvestrini

^{317}, M. Sjodahl

^{318}, P. Slavich

^{319}, M. Slawinska

^{320}, L. Soffi

^{321}, M. Spannowsky

^{322}, C. Speckner

^{323}, D. M. Sperka

^{324}, M. Spira

^{325}, O. Stål

^{326}, F. Staub

^{327}, T. Stebel

^{328}, T. Stefaniak

^{329}, M. Steinhauser

^{330}, I. W. Stewart

^{331}, M. J. Strassler

^{332}, J. Streicher

^{333}, D. M. Strom

^{334}, S. Su

^{335}, X. Sun

^{336}, F. J. Tackmann

^{337}, K. Tackmann

^{338}, A. M. Teixeira

^{339}, R. Teixeira de Lima

^{340}, V. Theeuwes

^{341}, R. Thorne

^{342}, D. Tommasini

^{343}, P. Torrielli

^{344}, M. Tosi

^{345}, F. Tramontano

^{346}, Z. Trócsányi

^{347}, M. Trott

^{348}, I. Tsinikos

^{349}, M. Ubiali

^{350}, P. Vanlaer

^{351}, W. Verkerke

^{352}, A. Vicini

^{353}, L. Viliani

^{354}, E. Vryonidou

^{355}, D. Wackeroth

^{356}, C. E. M. Wagner

^{357}, J. Wang

^{358}, S. Wayand

^{359}, G. Weiglein

^{360}, C. Weiss

^{361}, M. Wiesemann

^{362}, C. Williams

^{363}, J. Winter

^{364}, D. Winterbottom

^{365}, R. Wolf

^{366}, M. Xiao

^{367}, L. L. Yang

^{368}, R. Yohay

^{369}, S. P. Y. Yuen

^{370}, G. Zanderighi

^{371}, M. Zaro

^{372}, D. Zeppenfeld

^{373}, R. Ziegler

^{374}, T. Zirke

^{375}, J. Zupan

^{376}

**Affiliations:**

^{1}eds.,

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^{10}The LHC Higgs Cross Section Working Group,

^{11}The LHC Higgs Cross Section Working Group,

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^{301}The LHC Higgs Cross Section Working Group,

^{302}The LHC Higgs Cross Section Working Group,

^{303}The LHC Higgs Cross Section Working Group,

^{304}The LHC Higgs Cross Section Working Group,

^{305}The LHC Higgs Cross Section Working Group,

^{306}The LHC Higgs Cross Section Working Group,

^{307}The LHC Higgs Cross Section Working Group,

^{308}The LHC Higgs Cross Section Working Group,

^{309}The LHC Higgs Cross Section Working Group,

^{310}The LHC Higgs Cross Section Working Group,

^{311}The LHC Higgs Cross Section Working Group,

^{312}The LHC Higgs Cross Section Working Group,

^{313}The LHC Higgs Cross Section Working Group,

^{314}The LHC Higgs Cross Section Working Group,

^{315}The LHC Higgs Cross Section Working Group,

^{316}The LHC Higgs Cross Section Working Group,

^{317}The LHC Higgs Cross Section Working Group,

^{318}The LHC Higgs Cross Section Working Group,

^{319}The LHC Higgs Cross Section Working Group,

^{320}The LHC Higgs Cross Section Working Group,

^{321}The LHC Higgs Cross Section Working Group,

^{322}The LHC Higgs Cross Section Working Group,

^{323}The LHC Higgs Cross Section Working Group,

^{324}The LHC Higgs Cross Section Working Group,

^{325}The LHC Higgs Cross Section Working Group,

^{326}The LHC Higgs Cross Section Working Group,

^{327}The LHC Higgs Cross Section Working Group,

^{328}The LHC Higgs Cross Section Working Group,

^{329}The LHC Higgs Cross Section Working Group,

^{330}The LHC Higgs Cross Section Working Group,

^{331}The LHC Higgs Cross Section Working Group,

^{332}The LHC Higgs Cross Section Working Group,

^{333}The LHC Higgs Cross Section Working Group,

^{334}The LHC Higgs Cross Section Working Group,

^{335}The LHC Higgs Cross Section Working Group,

^{336}The LHC Higgs Cross Section Working Group,

^{337}The LHC Higgs Cross Section Working Group,

^{338}The LHC Higgs Cross Section Working Group,

^{339}The LHC Higgs Cross Section Working Group,

^{340}The LHC Higgs Cross Section Working Group,

^{341}The LHC Higgs Cross Section Working Group,

^{342}The LHC Higgs Cross Section Working Group,

^{343}The LHC Higgs Cross Section Working Group,

^{344}The LHC Higgs Cross Section Working Group,

^{345}The LHC Higgs Cross Section Working Group,

^{346}The LHC Higgs Cross Section Working Group,

^{347}The LHC Higgs Cross Section Working Group,

^{348}The LHC Higgs Cross Section Working Group,

^{349}The LHC Higgs Cross Section Working Group,

^{350}The LHC Higgs Cross Section Working Group,

^{351}The LHC Higgs Cross Section Working Group,

^{352}The LHC Higgs Cross Section Working Group,

^{353}The LHC Higgs Cross Section Working Group,

^{354}The LHC Higgs Cross Section Working Group,

^{355}The LHC Higgs Cross Section Working Group,

^{356}The LHC Higgs Cross Section Working Group,

^{357}The LHC Higgs Cross Section Working Group,

^{358}The LHC Higgs Cross Section Working Group,

^{359}The LHC Higgs Cross Section Working Group,

^{360}The LHC Higgs Cross Section Working Group,

^{361}The LHC Higgs Cross Section Working Group,

^{362}The LHC Higgs Cross Section Working Group,

^{363}The LHC Higgs Cross Section Working Group,

^{364}The LHC Higgs Cross Section Working Group,

^{365}The LHC Higgs Cross Section Working Group,

^{366}The LHC Higgs Cross Section Working Group,

^{367}The LHC Higgs Cross Section Working Group,

^{368}The LHC Higgs Cross Section Working Group,

^{369}The LHC Higgs Cross Section Working Group,

^{370}The LHC Higgs Cross Section Working Group,

^{371}The LHC Higgs Cross Section Working Group,

^{372}The LHC Higgs Cross Section Working Group,

^{373}The LHC Higgs Cross Section Working Group,

^{374}The LHC Higgs Cross Section Working Group,

^{375}The LHC Higgs Cross Section Working Group,

^{376}The LHC Higgs Cross Section Working Group

This Report summarizes the results of the activities of the LHC Higgs Cross Section Working Group in the period 2014-2016. The main goal of the working group was to present the state-of-the-art of Higgs physics at the LHC, integrating all new results that have appeared in the last few years. The first part compiles the most up-to-date predictions of Higgs boson production cross sections and decay branching ratios, parton distribution functions, and off-shell Higgs boson production and interference effects. Read More

Weak vector boson scattering at high energies will be one of the key measurements in current and upcoming LHC runs. It is most sensitive to any new physics associated with electroweak symmetry breaking. However, a conventional EFT analysis will fail at high energies. Read More

We present predictions for $t \bar t$ and $t \bar t H$ 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 phenomenology in the continuum at an unprecedented level of accuracy. Simulations are performed with the automated NLO Monte-Carlo framework WHIZARD interfaced to the OpenLoops matrix element generator. Read More

**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 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 GeV Higgs boson. Besides parameterizing deviations in terms of the dimension-8 operators that arise in the effective theory, we also study simplified models of new physics in $W/Z$ scattering in terms of scalar and tensor resonance multiplets. The high-energy asymptotics of all models is regulated by a universal unitarization procedure. Read More

Vector boson scattering is (together with the production of multiple electroweak gauge bosons) the key process in the current run 2 of LHC to probe the microscopic nature of electroweak symmetry breaking. Deviations from the Standard Model are generically parameterized by higher-dimensional operators, however, there is a subtle issue of perturbative unitarity for such approaches for the process above. We discuss a parameter-free unitarization prescription to get physically meaningful predictions. Read More

**Authors:**M. Vos, G. Abbas, M. Beneke, S. Bilokin, M. Costa, S. De Curtis, K. Fujii, J. Fuster, I. Garcia Garcia, P. Gomis, A. Hoang, A. Irles, Y. Kiyo, M. Kurata, L. Linssen, J. List, M. Nebot, M. Perello Rosello, R. Poeschl, N. Quach, J. Reuter, F. Richard, G. Rodrigo, Ph. Roloff, E. Ros, F. Simon, J. Tian, A. F. Zarnecki

A summary is presented of the workshop "top physics at linear colliders" that was held at IFIC Valencia from the 30th of June to the 3rd July 2015. We present an up-to-date status report of studies into the potential for top quark physics of lepton colliders with an energy reach that exceeds the top quark pair production threshold, with a focus on the linear collider projects ILC and CLIC. This summary shows that such projects can offer very competitive determinations of top quark properties (mass, width) and its interactions with other Standard Model particles, in particular electroweak gauge bosons and the Higgs boson. Read More

We give further evidence that genus-one fibers with multi-sections are mirror dual to fibers with Mordell-Weil torsion. In the physics of F-theory compactifications this implies a relation between models with a non-simply connected gauge group and those with discrete symmetries. We provide a combinatorial explanation of this phenomenon for toric hypersurfaces. Read More

In this talk I summarize the physics case of the International Linear Collider (ILC) focusing on its potential towards discovery, discrimation or disentanglement of new physics beyond the Standard Model (BSM). Read More

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-, eight- and ten-fermion processes, factorized processes and spin correlations. For lepton colliders, QCD NLO processes for top quark physics are available and will be discussed. Read More

State-of-the-art algorithms generate scattering amplitudes for high-energy physics at leading order for high-multiplicity processes as compiled code (in Fortran, C or C++). For complicated processes the size of these libraries can become tremendous (many GiB). We show that amplitudes can be translated to byte-code instructions, which even reduce the size by one order of magnitude. Read More

We give a status report on the automation of next-to-leading order processes within the Monte Carlo event generator WHIZARD, using GoSam and OpenLoops as provider for one-loop matrix elements. To deal with divergences, WHIZARD uses automated FKS subtraction, and the phase space for singular regions is generated automatically. NLO examples for both scattering and decay processes with a focus on e+e- processes are shown. Read More

We present the status of the automation of NLO processes within the event generator WHIZARD. The program provides an automated FKS subtraction and phase space integration over the FKS regions, while the (QCD) NLO matrix element is accessed via the Binoth Les Houches Interface from an externally linked one-loop program. Massless and massive test cases and validation are shown for several e+e- processes. Read More

The statistical nature of measurements alone easily causes unphysical estimates in quantum state tomography. We show that multinomial or Poissonian noise results in eigenvalue distributions converging to the Wigner semicircle distribution for already a modest number of qubits. This enables to specify the number of measurements necessary to avoid unphysical solutions as well as a new approach to obtain physical estimates. Read More

Motivated by the recent diphoton excesses reported by both ATLAS and CMS collaborations, we suggest that a new heavy spinless particle is produced in gluon fusion at the LHC and decays to a couple of lighter pseudoscalars which then decay to photons. The new resonances could arise from a new strongly interacting sector and couple to Standard Model gauge bosons only via the corresponding Wess-Zumino-Witten anomaly. We present a detailed recast of the newest 13 TeV data from ATLAS and CMS together with the 8 TeV data to scan the consistency of the parameter space for those resonances. Read More

We study in a bottom-up approach the theoretically consistent description of additional resonances in the electroweak sector beyond the discovered Higgs boson as simplified models. We focus on scalar and tensor resonances. Our formalism is suited for strongly coupled models, but can also be applied to weakly interacting theories. Read More

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. Read More

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 $e^+e^-\,\to\,t\bar{t}H$. Read More

We generalize the conjectured connection between quantum spectral problems and topological strings to many local almost del Pezzo surfaces with arbitrary mass parameters. The conjecture uses perturbative information of the topological string in the unrefined and the Nekrasov-Shatashvili limit to solve non-perturbatively the quantum spectral problem. We consider the quantum spectral curves for the local almost del Pezzo surfaces of $\mathbb{F}_2$, $\mathbb{F}_1$, the blowup of $\mathbb{P}^2$ in two points and a mass deformation of the $E_8$ del Pezzo corresponding to different deformations of the three-term operators $\mathsf{O}_{1,1}$, $\mathsf{O}_{1,2}$ and $\mathsf{O}_{2,3}$. 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

We construct four-dimensional, globally consistent F-theory models with three chiral generations, whose gauge group and matter representations coincide with those of the Minimal Supersymmetric Standard Model, the Pati-Salam Model and the Trinification Model. These models result from compactification on toric hypersurface fibrations $X$ with the choice of base $\mathbb{P}^3$. We observe that the F-theory conditions on the $G_4$-flux restrict the number of families to be at least three. Read More

We introduce a high-performance virtual machine (VM) written in a numerically fast language like Fortran or C to evaluate very large expressions. We discuss the general concept of how to perform computations in terms of a VM and present specifically a VM that is able to compute tree-level cross sections for any number of external legs, given the corresponding byte code from the optimal matrix element generator, O'Mega. Furthermore, this approach allows to formulate the parallel computation of a single phase space point in a simple and obvious way. Read More

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. Read More

In this paper we study the discovery potential of the LHC run II for heavy vector-like top quarks in the decay channel to a top and a $Z$ boson. Despite the usually smaller branching ratio compared to charged-current decays, this channel is rather clean and allows for a complete mass reconstruction of the heavy top. The latter is achieved in the leptonic decay channel of the $Z$ boson and in the fully hadronic top channel using boosted jet and jet substructure techniques. Read More

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. Read More

We consider F-theory compactifications on genus-one fibered Calabi-Yau manifolds with their fibers realized as hypersurfaces in the toric varieties associated to the 16 reflexive 2D polyhedra. We present a base-independent analysis of the codimension one, two and three singularities of these fibrations. We use these geometric results to determine the gauge groups, matter representations, 6D matter multiplicities and 4D Yukawa couplings of the corresponding effective theories. Read More

Quasi-elastic scattering of the vector bosons W and Z is a sensitive probe of the details of electroweak symmetry breaking, and a key process at future lepton colliders. We discuss the limitations of a model-independent effective-theory approach and describe the extension to a class of Simplified Models that is applicable to all energies in a quantitative way, and enables realistic Monte-Carlo simulations. The framework has been implemented in the Monte-Carlo event generator WHIZARD. Read More

We review the current status of the WHIZARD event generator. We discuss, in particular, recent improvements and features that are relevant for simulating the physics program at a future Linear Collider. Read More

We use mirror symmetry, quantum geometry and modularity properties of elliptic curves to calculate the refined free energies in the Nekrasov-Shatashvili limit on non-compact toric Calabi-Yau manifolds, based on del Pezzo surfaces. Quantum geometry here is to be understood as a quantum deformed version of rigid special geometry, which has its origin in the quantum mechanical behaviour of branes in the topological string B-model. We will argue that, in the Seiberg-Witten picture, only the Coulomb parameters lead to quantum corrections, while the mass parameters remain uncorrected. Read More

**Authors:**M. Baak, A. Blondel, A. Bodek, R. Caputo, T. Corbett, C. Degrande, O. Eboli, J. Erler, B. Feigl, A. Freitas, J. Gonzalez Fraile, M. C. Gonzalez-Garcia, J. Haller, J. Han, S. Heinemeyer, A. Hoecker, J. L. Holzbauer, S. -C. Hsu, B. Jaeger, P. Janot, W. Kilian, R. Kogler, A. Kotwal, P. Langacker, S. Li, L. Linssen, M. Marx, O. Mattelaer, J. Metcalfe, K. Monig, G. Moortgat-Pick, M. -A. Pleier, C. Pollard, M. Ramsey-Musolf, M. Rauch, J. Reuter, J. Rojo, M. Rominsky, W. Sakumoto, M. Schott, C. Schwinn, M. Sekulla, J. Stelzer, E. Torrence, A. Vicini, D. Wackeroth, G. Weiglein, G. Wilson, L. Zeune

**Category:**High Energy Physics - Phenomenology

With the discovery of the Higgs boson, the spectrum of particles in the Standard Model (SM) is complete. It is more important than ever to perform precision measurements and to test for deviations from SM predictions in the electroweak sector. In this report, we investigate two themes in the arena of precision electroweak measurements: the electroweak precision observables (EWPOs) that test the particle content and couplings in the SM and the minimal supersymmetric SM, and the measurements involving multiple gauge bosons in the final state which provide unique probes of the basic tenets of electroweak symmetry breaking. Read More

The Littlest Higgs model with T-parity is providing an attractive solution to the fine-tuning problem. This solution is only entirely natural if its intrinsic symmetry breaking scale f is relatively close to the electroweak scale. We examine the constraints using the latest results from the 8 TeV run at the LHC. Read More

In this Snowmass 2013 white paper, we review the effective field theory approach for studies of non-standard electroweak interactions in electroweak vector boson pair and triple production and vector boson scattering. We present an overview of the implementation of dimension six and eight operators in MadGraph5, VBFNLO, and WHIZARD, and provide relations between the coefficients of these higher dimensions operators used in these programs and in the anomalous couplings approach. We perform a tuned comparison of predictions for multi-boson processes including non-standard electroweak interactions with MadGraph5, VBFNLO, and WHIZARD. Read More

In this contribution to the Snowmass process 2013 (which is a preliminary version of [1]) we give a brief review of how new physics could enter in the electroweak (EW) sector of the Standard Model (SM). This new physics, if it is directly accessible at low energies, can be parameterized by explicit resonances having certain quantum numbers. The extreme case is the decoupling limit where those resonances are very heavy and leave only traces in the form of deviations in the SM couplings. Read More

The status of several prominent model implementations of the Little Higgs paradigm, the Littlest Higgs with and without discrete T-parity as well as the Simplest Little Higgs are reviewed. For this, we are taking into account a fit of 21 electroweak precision observables from LEP, SLC, Tevatron together with the full 25/fb of Higgs data reported by ATLAS and CMS. For the Littlest Higgs with T-parity an outlook on corresponding direct searches at the 8 TeV LHC is included. Read More

**Authors:**Howard Baer

^{1}, Tim Barklow

^{2}, Keisuke Fujii

^{3}, Yuanning Gao

^{4}, Andre Hoang

^{5}, Shinya Kanemura

^{6}, Jenny List

^{7}, Heather E. Logan

^{8}, Andrei Nomerotski

^{9}, Maxim Perelstein

^{10}, Michael E. Peskin

^{11}, Roman Pöschl

^{12}, Jürgen Reuter

^{13}, Sabine Riemann

^{14}, Aurore Savoy-Navarro

^{15}, Geraldine Servant

^{16}, Tim M. P. Tait

^{17}, Jaehoon Yu

^{18}

**Affiliations:**

^{1}University of Oklahoma, Department of Physics and Astronomy,

^{2}SLAC,

^{3}KEK,

^{4}TUHEP,

^{5}Universität Wien, Theoretische Physik,

^{6}University of Toyama, Department of Physics,

^{7}DESY,

^{8}Carleton University, Department of Physics,

^{9}University of Oxford, Particle Physics Department,

^{10}Cornell University, Laboratory for Elementary-Particle Physics,

^{11}SLAC,

^{12}LAL,

^{13}DESY,

^{14}DESY,

^{15}APC, CNRS/IN2P3,

^{16}CERN,

^{17}University of California, Department of Physics and Astronomy,

^{18}University of Texas, Center for Accelerator Science and Technology

**Category:**High Energy Physics - Phenomenology

The International Linear Collider Technical Design Report (TDR) describes in four volumes the physics case and the design of a 500 GeV centre-of-mass energy linear electron-positron collider based on superconducting radio-frequency technology using Niobium cavities as the accelerating structures. The accelerator can be extended to 1 TeV and also run as a Higgs factory at around 250 GeV and on the Z0 pole. A comprehensive value estimate of the accelerator is give, together with associated uncertainties. Read More

After the discovery of the Higgs-like boson by the LHC 2012 it is the most important task to check whether this new particle is the Standard Model Higgs boson or something else. In this paper, we study whether the 125 GeV boson could be the pseudo-Goldstone boson of Little Higgs models. We derive limits on the parameter space of several Little Higgs models (simple group and product group models, with and without T-parity), both from the experimental data from ATLAS and CMS about the different Higgs discovery channel and the electroweak precision observables. Read More

In this paper, we investigate how a sizeable width-to-mass ratio for a gluino, as is for example realized in GMSB scenarios, could affect the discovery potential of gluinos at the LHC. More importantly, the influence of the gluino being "fat" on the standard mass and spin determination methods at the LHC are investigated. For this purpose, we focus on gluino production at the LHC, where we do not factorize the first step in the gluino decay cascade, but treat the following decay cascades step in factorization, including full spin correlations. Read More

For many practical purposes, it is convenient to formulate unbroken non-abelian gauge theories like QCD in a color-flow basis. We present a new derivation of SU(N) interactions in the color-flow basis by extending the gauge group to U(N)xU(1)' in such a way that the two U(1) factors cancel each other. We use the quantum action principles to show the equivalence to the usual basis to all orders in perturbation theory. Read More

In this paper we study the gluino dijet mass edge measurement at the LHC in a realistic situation including both SUSY and combinatorical backgrounds together with effects of initial and final state radiation as well as a finite detector resolution. Three benchmark scenarios are examined in which the dominant SUSY production process and also the decay modes are different. Several new kinematical variables are proposed to minimize the impact of SUSY and combinatorial backgrounds in the measurement. 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

**Authors:**G. Brooijmans, B. Gripaios, F. Moortgat, J. Santiago, P. Skands, D. Albornoz Vásquez, B. C. Allanach, A. Alloul, A. Arbey, A. Azatov, H. Baer, C. Balázs, A. Barr, L. Basso, M. Battaglia, P. Bechtle, G. Bélanger, A. Belyaev, K. Benslama, L. Bergström, A. Bharucha, C. Boehm, M. Bondarenko, O. Bondu, E. Boos, F. Boudjema, T. Bringmann, M. Brown, V. Bunichev, S. Calvet, M. Campanelli, A. Carmona, D. G. Cerdeño, M. Chala, R. S. Chivukula, D. Chowdhury, N. D. Christensen, M. Cirelli, S. Cox, K. Cranmer, J. Da Silva, T. Delahaye, A. De Roeck, A. Djouadi, E. Dobson, M. Dolan, F. Donato, G. Drieu La Rochelle, G. Duda, C. Duhr, B. Dumont, J. Edsjö, J. Ellis, C. Evoli, A. Falkowski, M. Felcini, B. Fuks, E. Gabrielli, D. Gaggero, S. Gascon-Shotkin, D. K. Ghosh, A. Giammanco, R. M. Godbole, P. Gondolo, T. Goto, D. Grasso, P. Gris, D. Guadagnoli, J. F. Gunion, U. Haisch, L. Hartgring, S. Heinemeyer, M. Hirsch, J. Hewett, A. Ismail, T. Jeltema, M. Kadastik, M. Kakizaki, K. Kannike, S. Khalil, J-L. Kneur, M. Krämer, S. Kraml, S. Kreiss, J. Lavalle, R. Leane, J. Lykken, L. Maccione, F. Mahmoudi, M. Mangano, S. P. Martin, D. Maurin, G. Moreau, S. Moretti, I. Moskalenko, G. Moultaka, M. Muhlleitner, I. Niessen, B. O'Leary, E. Orlando, P. Panci, G. Polesello, W. Porod, T. Porter, S. Profumo, H. Prosper, A. Pukhov, A. Racioppi, M. Raidal, M. Rausch de Traubenberg, A. Renaud, J. Reuter, T. G. Rizzo, T. Robens, A. Y. Rodríguez-Marrero, P. Salati, C. Savage, P. Scott, S. Sekmen, A. Semenov, C. -L. Shan, C. Shepherd-Themistocleous, E. H. Simmons, P. Slavich, C. Speckner, F. Staub, A. Strong, R. Taillet, F. S. Thomas, M. C. Thomas, I. Tomalin, M. Tytgat, M. Ughetto, L. Valéry, D. G. E. Walker, A. Weiler, S. M. West, C. D. White, A. J. Williams, A. Wingerter, C. Wymant, J. -H. Yu, C. -P. Yuan, D. Zerwas

We present the activities of the "New Physics" working group for the "Physics at TeV Colliders" workshop (Les Houches, France, 30 May-17 June, 2011). Our report includes new agreements on formats for interfaces between computational tools, new tool developments, important signatures for searches at the LHC, recommendations for presentation of LHC search results, as well as additional phenomenological studies. 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

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 initial-state 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. 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

We report the results of a computation of the full next-to-leading order QCD corrections to the production of two $b\bar{b}$ pairs at the LHC. This calculation at the parton level provides predictions for well separated $b$-jets. The results show that the next-to-leading order corrections lead to an enhancement of the cross-section for the central scale choice by roughly 50% with respect to the leading order result. Read More

We present a program that allows for the computation of tensor products of irreducible representations of Lie algebras A-G based on the explicit construction of weight states. This straightforward approach (which is slower and more memory-consumptive than the standard methods to just calculate dimensions of the tensor product decomposition) produces Clebsch-Gordan coefficients that are of interest for instance in discussing symmetry breaking in model building for grand unified theories. For that purpose, multiple tensor products have been implemented as well as means for analyzing the resulting effective operators in particle physics. Read More