The webpage has been migrated in March 2013 from http://www.ifh.de/~riemann to
http://hugoriemann.de.
Private homepage
Dr. Tord Robert Riemann
Retired (December 2016) from research staff at DESY, Zeuthen location, Theory Group
"Zwei Dinge erfüllen das Gemüth mit immer neuer und zunehmender Bewunderung und Ehrfurcht, je öfter und anhaltender sich das
Nachdenken damit beschäftigt: der bestirnte Himmel über mir und das moralische Gesetz in mir.
Beide darf ich nicht als in Dunkelheiten verhüllt, oder im Überschwenglichen, außer meinem Gesichtskreise suchen und blos
vermuthen; ich sehe sie vor mir und verknüpfe sie unmittelbar mit dem Bewusstsein meiner Existenz."
Immanuel Kant, Kritik der praktischen Vernunft, Beschluß (Riga 1788)
Dr. Tord Riemann
Contact:
Personalities:
 19772016 Staff at Theory Group, DESY, Zeuthen location, Germany
 9/19838/1987 Lab. for Theoretical Physics, JINR Dubna, Russia
 9/19918/1992 Theory Division, CERN, Geneva, Switzerland
See also
German Wikipedia.
Prof. Dr. Albrecht Wagner: Note on occasion of Tord Riemann's 25 years of service at IfH/DESY on 1 March 2002 (in German)
Talk by J. Gluza, Zeuthen, Germany, 23 June 2011:
"The Bhabha Project"
Tord Riemann, CV
Summary 2015
Tord Riemann, Curriculum Vita 2015
Tord Riemann, Publications 2015
The official webpage of the ZFITTER collaboration has changed in 2015:
http://sanc.jinr.ru/users/zfitter/.
The Report of the OmbudsKollegium of Hamburg University (17 November 2015) is available on justified request.
The Foundation for Polish Science has awarded to Tord Riemann the
Alexander von Humboldt Polish Honorary Research Fellowship that is being carried out at University of Silesia in cooperation with the host prof.
Janusz Gluza. Reference: http://www.fnp.org.pl/en/stypendiaimavonhumboldtaprzyznanekonkurs2015/>.
Responsibilities:
 Since 05/2005 spokesperson of the ZFITTER project, see also http://zfitter.com
Since 2012, there is no ZFITTER project support at DESY, due to the plagiarism affair caused by the Gfitter collaboration.
The actual version is ZFITTER v.6.44beta. Available on request.
In case of interest, send me a private email.
Past:

12/2013  03/2018 Principal Investigator in
Research Training Group Mass, Spectrum, Symmetry
(GK 1504):
"Particle Physics in the Era of the Large Hadron Collider"
 2003  2014 Project Leader in SFB/TRR 9 of DFG, project B1:
"Precision calculations of massive particle production processes"
 08/200907/2011 Spokesperson of Theory Group, DESY, Zeuthen.
The scientific misuse of ZFITTER by the Gfitter collaboration was discovered in 03/2011.
 12/200611/2010 Node coordinator, member of steering committee,
and network task coordinator for "tools" of TMR Network (RTN) of the
European Commission:
"HEPTOOLS  Tools and Precision Calculations for Physics Discoveries at Colliders"
 8/20007/2004 Node coordinator of TMR Network (RTN) of the European Commission:
"Particle Physics Phenomenology at High Energy
Colliders"
 199309  199606 Node coordinator of EUNEPHESMA,
"Phenomenology of the Standard Model and alternatives for present and
future high
energy colliders",
HCM project,
framework 3C
 4/20044/2008 Spokesperson of Theory Group, DESY, Zeuthen
 9/19938/1995 Spokesperson of Theory Group, DESY, Zeuthen
Lehre:

2006  2011: Vorlesungen und Übungen am Institut für Physik und Astronomie der Universität Potsdam zu "Theorie des Standardmodells und Colliderphysik"; Lehraufträge.
SS 2010: go
here (in German)
SS 2011, 2012, 2013: Vorlesung wird bei Bedarf angeboten.

2013  2015: Vorlesungen zu "Theorie des Standardmodells und Colliderphysik" an der TU Dresden (TUD)
TUD, Wintersemester 2013/2014, siehe hier:
13/14.
TUD, Wintersemester 2014/2015, siehe hier:
14/15.

DESY, Zeuthen, Sommersemester 2016: "Selected Advanced Topics of the
Electroweak Standard Model", by invitation.
Conferences and Advanced Schools:
 CoChair and member of Organizing Committee or Program Committee of "Helmholtz International School  Workshop Calculations for Modern and Future Colliders", JINR, Dubna, Russia:
2018: CALC 2018
2015: CALC 2015
2012: CALC 2012
2009: CALC 2009
2006: CALC 2006
 From 2002 regularly Member of Advisory Boards of the Workshop series "RADCOR" (till 2017) and "ACAT" (till 2016)
Organizer of the biannual workshop series
Conference "Loops and Legs in Quantum Field Theory"
The "Loops and Legs" series was organized 1992 till 1996 with changing workshop titles and got its name in 1998.
Coorganizers:
J. Bluemlein, F. Jegerlehner, J.H. Kuehn, S. Moch, P. Marquard.
The conference series name "Loops and Legs" is a copyrighted, registered word mark (eingetragene Wortmarke) of Dr. Tord Riemann, Koenigs Wusterhausen. See Wortmarke "Loops and Legs".
The copyrighting became necessary due to a trial to unfriendly takeover the "Loops and Legs" conference series in 2018.
The "Loops and Legs" workshop series is being interrupted in 2020 and will be reactivated in 2022.
2005  2015: Coorganizer of the biannual series of advanced DESY Schools
Scientific Fields of Interest:
 Physics at the FCCee, GigaZ mode

Calculation of multiloop massive Feyman integrals

Representation of massive oneloop Feynman integrals by MellinBarnes integrals or by generalized hypergeometric functions

LHC physics
 Loop calculations
 NNLO Bhabha scattering in QED

Higher order corrections in the electroweak Standard Model
(and some extensions)

Phenomenology of elementary particles;
precision tests of fundamental interactions
 Linear Collider physics; Higgs, WW, ZZ, 2f and 4f
production in e+e scattering

HERA physics; QED and electroweak corrections for deep inelastic
scattering at HERA

Ethical and legal problems related to development and sharing of
software in international academic basic research.
See "Summary of
the ACAT Round Table Discussion: Opensource, knowledge sharing and
scientific collaboration", with F. Carminati and D. PerretGallix, DESY
14079 (arXiv:1407.0540) and Journal of Physics: Conference Series 523 (2014) 0120 (ACAT
2014)

See also the homepages on
PHOKHARA,
BABAYAGA,
PJFry,
AMBRE,
Bhabha Scattering,
DIANA_aITALC,
ZFITTER,
HECTOR
Publications:
inSPIRE search
arXiv.org search
Conference Talks and Lectures at Advanced Schools:
2019

"Scalar 1loop Feynman integrals in arbitrary spacetime dimension D"
Talk at 11th FCCee meeting, workshop: Theory and Experiments
January, 8  11, 2019, CERN
[slides.pdf],
[TH report in prepar.]
2018

"Feynman integrals and MellinBarnes Representations – Introduction and Challenges –"
Talk at COST meeting, Katowice, Poland
“Case studies of analytical and numerical multiloop methods for future e + e ? colliders”,
Joint Meeting of Working Group 1 and Working Group 3
of COST Action CA16201:
"PARTICLEFACE – Unraveling new physics at the LHC through the precision frontier",
15 October 2018, Silesian University, Katowice, Poland
[slides.pdf]

"A legacy of Dima Bardin: ZFITTER and the future
Ein Vermächtnis von Dima Bardin: ZFITTER und die Zukunft"
Talk at CALC 2018,
July 23  31, 2018, JINR, Dubna, Russia
The Workshop is dedicated to the memory of Dmitry Yu. Bardin (1945 – 2017)
[slides.pdf]

"Scalar 1loop Feynman integrals in arbitrary spacetime dimension D"
Talk at CALC 2018,
July 23  31, 2018, JINR, Dubna, Russia
[slides.pdf]

"Scalar oneloop Feynman integrals in arbitrary spacetime dimension"
Talk at LL2018,
14th Workshop “Loops and Legs in Quantum Field Theory” LL2018, April 29  May 4, 2018, St. Goar, Germany
[slides.pdf],
[not in proceedings]

"The Z boson line shape at the FCCee  From 1.5 loops at LEP to 2.5 loops in future"
Talk at FCCee TeraZ mini workshop
“Precision EW and QCD calculations for the FCC studies: Methods and techniques”, 1213 January 2018, CERN, Geneva, Switzerland
[slides.pdf],
several contributions in the
[proceedings.pdf],
A. Blondel, J. Gluza, S. Jadach, P. Janot, T. Riemann (eds.),
"Standard Model Theory for the FCCee: The TeraZ", arXiv:1809.01830,
to appear as CERN Yellow Report (2019)
2017

"Scalar oneloop integrals as meromorphic functions of spacetime dimension d"
Talk at MTTD,
workshop “Matter To The Deepest”, XLI International Conference on Recent Developments In Physics Of Fundamental Interactions MTTD 2017, September 38, 2017, Podlesice, Poland
[slides.pdf],
[proceedings.pdf]
Acta Phys. Polon. B48 (2017) 2313

"Feynman diagrams and MellinBarnes integrals"
Two CAPP 2017 lectures,
given at 7th School on Computer Algebra and Particle Physics  CAPP 2017,
2024 March 2017, DESY, Hamburg
[slides.pdf]
2016

"30 years, 750 integrals, and 1 dessert, or: Bosonic contributions to the 2loop Zbb vertex",
Talk held at LL2016, April 2016, Leipzig, Germany,
LL2016,
slides
2015

"Studying the Z boson resonance  not with weak loops  but with the SMATASY/ZFITTERkit",
Talk held at "The HighEnergy Physics KIT â€“ HEPKIT2015"
58 October 2015, Karlsruhe Institute of Technology (KIT)
workshop page,
[.pdf].

"Smatrix approach to the Z resonance
or: The Z resonance without weak loops
or: The SMATASY/ZFITTER approach to the Z resonance",
Talk held
workshop "Matter To The Deepest"
XXXIX International Conference on Recent Developments In Physics Of Fundamental Interactions
September 1318, 2015, Ustron, Poland
workshop page,
[.pdf]; contribution submitted to the proceedings in Acta Physica Polonica.

"Smatrix approach to the Z line shape
or: The Z resonance without weak loops
or: The SMATASY/ZFITTER approach to the Z resonance",
Talk held at
workshop CALC  "Calculations for Modern and Future Colliders",
July 2330 2015, JINR, Dubna, Russia
workshop page,
[.pdf]

"Smatrix approach to the Z line shape  A reminiscence. Prospects?",
Talk held at 9th FCCee (TLEP) Physics workshop (TLEP9), 35 February 2015, Scuola Normale Superiore, Pisa, Italy,
workshop page,
[.pdf],
video life stream.
2014

"Massive Feynman integrals and electroweak corrections",
Talk held at final meeting of Sonderforschungsbereich/Transregio 9 of DFG
"Advances in Computational Particle Physics" for Project Group B "Predictions for High Energy Reactions",
Project B1 "Precision Predictions for Massive Particle Production (2001114)",
1519 Sep 2014, AiCPP_2014, Durbach, Germany,
workshop page,
[.pdf].
Published in the proceedings: Nucl. Part. Phys. Proc. 261262 140154,
and
arXiv/1412.3311.

"Nonplanar Feynman diagrams and
MellinBarnes representations with AMBRE", Talk held at
16th Int. WS on Advanced Computing and Analysis Techniques in Physics Research (ACAT),
Faculty of Civil Engineering, Czech Technical University, 15 September 2014, Prague,
Track 3: Computations in Theoretical Physics: Techniques and Methods,
workshop page.
Published in the proceedings in the IOP Conference Series: J. Phys. Conf. Ser. 608(2015)1, 012070.

"Electroweak corrections for top@ILC: 2004  2014  2024",
Talk held at "Workshop on Top physics at the LC",
Session on electroweak couplings and higher order corrections,
LPNHE, Paris, France, 56 March, 2014,
workshop page,
[.pdf]
2013

"Contractions of 1loop 5point
tensor Feynman integrals", Talk held at Int. Conference
Matter to the Deepest
Recent Developments In Physics of Fundamental
Interactions,
Ustron, Poland, 16 Sep, 2013,
workshop page,
[.pdf]

"Replacing 1loop tensor reduction by contractions", Talk at
11th International Symposium on Radiative Corrections
 Applications of Quantum Field Theory to Phenomenology  RADCOR 2013, 22  27 Sep 2013, Lumley Castle,
workshop page,
[.pdf]
2013

"Contractions of 1loop 5point tensor Feynman integrals",
Talk held at
ACAT2013  15th Int. WS on Advanced Computing
and Analysis Techniques in Physics Research
May 16  21, 2013, IHEP, Beijing, China
workshop page,
[.pdf],
[.pdf]

Round Table Discussion at ACAT2013: "Opensource, knowledge sharing and
scientific collaboration"
Speakers: Prof. Gang Chen (Institute of High Energy Physics), Dr. Tord
Riemann (DESY), Dr. Denis PerretGallix (LAPP/IN2P3CNRS), Prof.
Lawrence Pinsky (Physics Department, University of Houston),
Writeup:
DESY 14079 (hepph/1407.0540)

"Feynman Integrals and MellinBarnes representations",
Talk held at
"Computer Algebra and Particle Physics", The
DESY CAPP
School, 11 March  15 March 2013, Zeuthen, Germany
[.pdf]
2012

"ZFITTER and LHC physics", Talk held at Parallel Session on "EW and QCD Physics"
at
6th Annual Workshop of the Helmholtz Alliance "Physics at the Terascale",
35 December 2012, DESY, Hamburg, Germany,
AnnualTerascaleAlliance2012; p.23 of slides had to be changed,
[.pdf]

"Progress in tensor reduction of 1loop Feynman integrals", Talk held at
HP2: High Precision for Hard Processes, 47 September 2012, Max Planck Institute
for Physics, Munich, Germany,
HP2
[.pdf]

"New results for algebraic, oneloop Tensor reduction of Feynman integrals",
Talk held at
5th Helmholtz International Summer School  Workshop Dubna International
Advanced School of Theoretical Physics  DIAS TH, Calculations for
Modern and Future Colliders, July 23  August 2, 2012, Dubna, Russia,
CALC
[.pdf]

"Simple Feynman diagrams and simple sums", Talk held at
RISC  DESY Workshop on Advanced Summation Techniques and their Applications in
Quantum Field Theory
on the occasion of the 5th year jubilee of the RISCDESY cooperation,
May 0708, 2012, RISC Institute, Castle of Hagenberg, Linz, Austria,
RISCDESY12
[.pdf]

"ZFITTER  20 years after", Talk held at "Loops and Legs in Quantum Field
Theory", 1520 April 2012, Wernigerode, Germany, LL2012
[.pdf]

"New results on tensor reduction",
Talk held at regular meeting of SFB/TR9, 20 March 2012, Karlsruhe, Germany
[.pdf]

"ZFITTER in the Era of the LHC and a Linear Collider  or  The Quest for
Precision",
Talk held at 3rd LCFORUM
meeting, 79 February 2012, DESY, Hamburg,
Germany
[.pdf]
2011

"Tensor integrals  New solutions to old problems",
Talk held at German Japanese
Workshop on "Modern Trends in Quantum
Chromodynamics", 35 October 2011, DESY, Zeuthen, Germany
[.pdf]

"New results for algebraic NLO Tensor reduction of Feynman integrals",
Talk held at
RADCOR,
2630 September 2011, Radisson Resort Temple Bay,
Mamallapuram, India
[.pdf]

"New results for algebraic NLO Tensor reduction of Feynman integrals",
Talk at
ACAT, Sep 04 ? Sep 09, 2011, Brunel
Univ., London, England
[.pdf]

"New results for algebraic NLO Tensor reduction of Feynman integrals",
Talk held at Workshop on
QCD
at the LHC, Aug 21 ? Aug 25, 2011, St. Andrews, Scotland
[.pdf]

"Feynman Integrals and MellinBarnes representations",
Talk held at
"Computer Algebra and Particle Physics", The
DESY CAPP
School, 21 March ? 25 March 2011, Zeuthen, Germany
[.pdf]
2010

"Bhabha scattering  Status of Theory Predictions",
Research Workshop of the Israel Science Foundation
High precision measurements of luminosity at future linear colliders and
polarization of lepton beams
3  5 October 2010, School of Physics and Astronomy, Tel Aviv University, Tel
Aviv, Israel
[.pdf]

"Algebraic tensor Feynman integral reduction",
Corfu Summer Institute, Aug 29 ? Sep 5, 2010, Corfu, Greece
[.pdf]

"Feynman Integrals  MellinBarnes representations  Sums",
Two lectures given at HumboldtUniversität zu Berlin, June 2010
[.pdf]

"Need of precision tools for ILC electroweak physics",
1st Meeting of the Linear Collider Forum (LCFORUM) of the Helmholtz Alliance for
Physics at the Tera Scale
Monday 14 June 2010, DESY, Hamburg, Germany
[.pdf]

"Some variations of the reduction of oneloop Feynman tensor integrals",
ACAT, February 2010, Jaipur, India,
[.pdf]
2009

"A recursive reduction of tensor Feynman integrals", talk held at
Radcor 2009,
"9th International Symposium on Radiative Corrections  Application of Quantum
Field Theory to Phenomenology", Ascona, Switzerland, October,
2009.
[.pdf]

"Evaluation of Feynman diagrams with MellinBarnes representations",
lecture given at
CALC 2009,
"Helmholtz International SchoolWorkshop on Calculations for Modern and Future
Colliders", July 2009, JINR, Dubna, Russia.
[.pdf]

"Bhabha Scattering Theory State of the Art",
talk held at
FCAL collaboration meeting,
June 2009, Zeuthen, Germany.
[.pdf]

"Feynman Integrals, MellinBarnes representations, Sums",
lecture given at
CAPP 2009,
March/April 2009, Zeuthen, Germany.
[.pdf]

"Evaluation of Feynman Integrals: Advanced Methods",
three lectures given at
RECAPP
2009,
February 2009, Allahabad, India.
[.pdf]
2008

Seminar talk at Edinburgh University, 10 December 2008 on "NNLO contributions
to Bhabha scattering"
[.pdf]

ACAT, November 2008, Erice, Italy,
[.pdf]

RadioMontecarLow Workshop, 4th Meeting of the Working Group on Radiative
Corrections and Monte Carlo Generators for Low Energies, October
2008, IHEP, Beijing, China
[.pdf]

RadioMontecarLow Workshop, 3rd Meeting of Working Group on Radiative Corrections
and Generators for Low Energy Hadronic Cross Section and
Luminosity, April 2008, INFN, Frascati, Italy
[.pdf]
Talks before 2008: More Talks
Ph.D Students:

Dr. J. Usovitsch,
Ph.D.
Thesis (HumboldtUniversität zu Berlin 2018):
"Numerical evaluation of MellinBarnes integrals in Minkowskian regions and their application to twoloop bosonic electroweak contributions to the weak mixing angle of the Zbbvertex".
Cosupervisor: Prof. P. Uwer

Dr. V. Yundin,
Ph.D.
Thesis (HumboldtUniversität zu Berlin 2012):
"Massive loop corrections for collider physics". Cosupervisor: Prof. J. Plefka
 Dr. A. Lorca,
Ph.D. Thesis (Universität Bielefeld 2005):
" Calculation and automation of oneloop corrections to 2 to 2 fermion processes".
Cosupervisor: Prof. J. Fleischer
 Dr. M. Jack,
Ph.D. Thesis
(HumboldtUniversität zu Berlin 2000):
"Semianalytical calculation of QED radiative corrections to e+e >
f(bar)f with special emphasis on kinematical cuts to the final state".
Cosupervisor: Prof. M. MüllerPreussker
 Dr. J. Biebel, Ph.D.
Thesis (HumboldtUniversität zu Berlin 2001):
"Predictions for the search for anomalous couplings of gauge bosons and leptons in e+e scattering".
Cosupervisor: Prof. D.Lüst
 Dr. D. Lehner,
Ph.D. Thesis(HumboldtUniversität zu Berlin 1995)
" Initial state radiative corrections to Z0 pair production in e+e annihilation: The Semianalytical approach".
Cosupervisor: Prof. M. MüllerPreussker
Diploma Students:

F. Haas, Diploma thesis (Universität Potsdam 2008): "Application of MellinBarnes representations to
the evaluation of radiative loop diagrams in Bhabha scattering". Cosupervisor: Prof. M. Wilkens

A. Krüger, Diploma thesis (HumboldtUniversität zu Berlin 1998):
"Vorhersagen für Effekte schwerer neutraler Eichbosonen am
epBeschleuniger HERA". Cosupervisor: Prof. D. Ebert
2001 First Prize of the Joint Institute for Nuclear Research, Dubna
awarded January 19, 2001 by the Scientific Council of
the JINR Dubna for the project
"Theoretical support of experiments at the Z resonance on
precision tests of the standard model (Project ZFITTER)"
An old story: LFV Z decays
Here you may find some references from the Eighties on
flavornondiagonal Zboson decays in the Standard Model (with massive,
mixing neutrinos or top quarks in the loop).
Some Fortran programs:
Because there happened misunderstandings about the conditions of use
of opensource software, it might not be appropriate to further
distribute software using this platform.
All the corresponding links have been deactivated.
In some cases you may find the programs of interest in the program
repository of "Computer Physics Communications", or you may contact me [
or coauthors] directly.
 ZFITTER  A Program for the SemiAnalytic Calculation
of Predictions for the Process e+e > 2f
click
here for the DESY ZFITTER home page.
The earlier zfitter homepage has been relocated to XXXXXXX.com.
 topfit  A Program for the SemiAnalytic Calculation
of Predictions for the Process e+e > t bart (+ photon)
Authors: J. Fleischer, A. Leike, T. Riemann, A. Werthenbach
preprint
DESY 02204, March 2003
ePrint Archive: hepph/0302259
Click
here for the DESY, Zeuthen topfit homepage
 GENTLE/4fan  A Program for the SemiAnalytic Calculation
of Predictions for the Process e+e > 4f
Authors: D. Bardin, J. Biebel, D. Lehner, A. Leike,
A. Olchevski, T. Riemann
Published in Comput. Phys. Commun. 104 (1997) 161187
preprint
DESY 96233, December 1996
ePrint Archive: hepph/9612409
Click
here for the DESY, Zeuthen GENTLE homepage:
See also for J. Biebel's project
ZAC on
anomalous ZZZ and ZZA couplings in the Process e+e > 4f
 Predictions for Anomalous tau+ tau gamma Production at LEP 1
Authors: Jochen Biebel and Tord Riemann
Published in Z. Phys. C76 (1997) 5358
preprint
DESY 96212, October 1996, 13pp.
ePrint Archive: hepph/9610437
Click here for the program:
anotau.f
 HECTOR 1.00  A program for the calculation of QED, QCD and
electroweak corrections to ep and lN deep
inelastic neutral and charged current
scattering
Authors: A. Arbuzov, D. Bardin, J.Bluemlein, P. Christova,
L. Kalinovskaya, T. Riemann
Picture
(Caution: 1.9 Mb!)
click
here for the DESY, Zeuthen HECTOR home page
Comput. Phys. Commun. 94 (1996) 128184, hepph/9511434
DESY 95185
Source code
Additional applications are possible with v.1.11; see:
DESY 96189 (spin physics)
DESY 96213 (tagged photons)
New beta version of the
source code
 SMATASY: a program for the model independent description of
the Z resonance
Authors since version 5.02: Martin Gruenewald, Stefan Kirsch
and Tord Riemann
Preprint DESY 94125 [hepph/9408365];
Preprint
publ. in Comput. Phys. Commun. 88 (1995) 89
Find here version 6.10 (15 May 1999), running with ZFITTER v.6.10:
/afs/cern.ch/user/g/gruenew/public/smatasy/smata6_10.fortran
smatasy5_02.f
This version runs together with ZFITTER_beta (Feb 1997),
click here:
zfitr_beta_02_1997.uu
SMATASY (May 1998) runs together with ZFITTER
v. 5_1 (March 1998), click here:
smata5_10.fortran and here:
zfitr_beta_02_1997.uu
The SMATASY code may be found
here.
In March 2000, the last one is
here.
Guest homepage of Prof. Jochem Fleischer at DESY: JF
Back to the DESY, Zeuthen Theory Group home page
Disclaimer