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Dr. Tord Riemann

Contact until March 2019:

• Address: DESY, Platanenallee 6, 15738 Zeuthen, Germany
• Group: Theory, Room: 3L10, Tel: +49(33762)77-270, E-mail: Tord.Riemann_ at_ desy.de
• Theory Group, DESY, Zeuthen
• A private homepage

Contact from April 2019:

• Group: Theory Status: retired November 2016, Tel: +49(33762)77-xxx, E-mail: Tord.Riemann_ at_ desy.de
• Theory Group, DESY, Zeuthen
• The actual, private homepage

From Summer 2016, this webpage is not updated. See instead: Private homepage of Tord Riemann

Personalities:

• 1977 - 2016 Staff at Theory Group, DESY, Zeuthen, Germany
• 9/1983-8/1987 Lab. for Theoretical Physics, JINR Dubna, Russia
• 9/1991-8/1992 Theory Division, CERN, Geneva, Switzerland

Responsibilities:

• Since 12/2013 Principal Investigator in Research Training Group "Mass, Spectrum, Symmetry (GK 1504): Particle Physics in the Era of the Large Hadron Collider"
  
• Since 05/2005 spokesperson of the ZFITTER project, webpage at JINR, Dubna, Russia
  
  Past:
  
• 08/2009-07/2011, 4/2004-4/2008, 9/1993-8/1995 Spokesperson of Theory Group, DESY, Zeuthen
• 2003-2014 Project Leader in SFB/TRR 9 of DFG, project B1:
  "Precision calculations of massive particle production processes"
  
• 12/2006-11/2010 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"
• 8/2000-7/2004 Node coordinator of TMR Network (RTN) of the European Commission: "Particle Physics Phenomenology at High Energy Colliders"
• 1993-09 - 1996-06 Node coordinator of EUNEPHESMA, "Phenomenology of the Standard Model and alternatives for present and future high energy colliders", HCM project, framework 3C

Lehre:

Conferences and Advanced Schools:

• Co-Chair of "Helmholtz International School - Workshop Calculations for Modern and Future Colliders", JINR, Dubna, Russia:
  2012: CALC 2012
  2009: CALC 2009
  2006: CALC 2006

• Since 2005: "International Symposium on Radiative Corrections - Applications of Quantum Field Theory to Phenomenology (Radcor)"
  For a list of meetings before 2011 see here
• Since 2005: "Workshop on Advanced Computing and Analysis Techniques in Physics Research (ACAT)"
  For a webpage see ACAT2005 at DESY, Zeuthen
• Since 2005: "Matter to the deepest", University of Silesia, Katowice, Ustron
  For the 2007 webpage see here

• Conference "Loops and Legs in Quantum Field Theory" LL 2014 in Weimar
  Former events: LL 1992 in Teupitz, LL 1994 in Teupitz, LL 1996 in Rheinsberg, LL 1998 in Rheinsberg, LL 2000 in Bastei/Königstein, LL 2002 in Kloster Banz, LL 2004 in Zinnowitz, LL 2008 in Eisenach, LL 2008 in Schloss Sondershausen, LL 2010 in Woerlitzer Park, LL 2012 in Wernigerode
  
  
• CAPP - DESY School "Computer Algebra and Particle Physics"
  CAPP 2005, CAPP 2007, CAPP 2009, CAPP 2011, CAPP 2013

Scientific Fields of Interest:

• 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: Open-source, knowledge sharing and scientific collaboration", with F. Carminati and D. Perret-Gallix, DESY 14-079 (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:

Conference Talks and Lectures at Advanced Schools:

2016

• "30 years, 750 integrals, and 1 dessert, or: Bosonic contributions to the 2-loop 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/ZFITTER-kit", Talk held at "The High-Energy Physics KIT – HEPKIT2015" 5-8 October 2015, Karlsruhe Institute of Technology (KIT) workshop page, [.pdf].
• "S-matrix 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 13-18, 2015, Ustron, Poland workshop page, [.pdf]; contribution submitted to the proceedings in Acta Physica Polonica.
• "S-matrix 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 23-30 2015, JINR, Dubna, Russia workshop page, [.pdf]
• "S-matrix approach to the Z line shape - A reminiscence. Prospects?", Talk held at 9th FCC-ee (TLEP) Physics workshop (TLEP9), 3-5 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 (20011-14)", 15-19 Sep 2014, AiCPP_2014, Durbach, Germany, workshop page, [.pdf].
  Published in the proceedings: Nucl. Part. Phys. Proc. 261-262 140-154, and arXiv/1412.3311.
• "Non-planar Feynman diagrams and Mellin-Barnes 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, 1-5 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, 5-6 March, 2014, workshop page, [.pdf]
  
  2013
  
• "Contractions of 1-loop 5-point tensor Feynman integrals", Talk held at Int. Conference Matter to the Deepest Recent Developments In Physics of Fundamental Interactions, Ustron, Poland, 1-6 Sep, 2013, workshop page, [.pdf]
• "Replacing 1-loop 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]
• "Contractions of 1-loop 5-point 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]
  Round Table Discussion at ACAT2013: "Open-source, knowledge sharing and scientific collaboration", Speakers: Prof. Gang Chen (Institute of High Energy Physics), Dr. Tord Riemann (DESY), Dr. Denis Perret-Gallix (LAPP/IN2P3-CNRS), Prof. Lawrence Pinsky (Physics Department, University of Houston), write-up: DESY 14-079 (hep-ph/1407.0540)
• "Feynman Integrals and Mellin-Barnes 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", 3-5 December 2012, DESY, Hamburg, Germany, AnnualTerascaleAlliance2012; p.23 of slides had to be changed, [.pdf]
  
• "Progress in tensor reduction of 1-loop Feynman integrals", Talk held at HP2: High Precision for Hard Processes, 4-7 September 2012, Max Planck Institute for Physics, Munich, Germany, HP2 [.pdf]
  
• "New results for algebraic, one-loop 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 RISC-DESY cooperation, May 07-08, 2012, RISC Institute, Castle of Hagenberg, Linz, Austria, RISCDESY12 [.pdf]
  
• "ZFITTER - 20 years after", Talk held at "Loops and Legs in Quantum Field Theory", 15-20 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, 7-9 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", 3-5 October 2011, DESY, Zeuthen, Germany [.pdf]
  
• "New results for algebraic NLO Tensor reduction of Feynman integrals", Talk held at RADCOR, 26-30 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 Mellin-Barnes 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 - Mellin-Barnes representations - Sums", Two lectures given at Humboldt-Universität 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 one-loop 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 Mellin-Barnes representations", lecture given at CALC 2009, "Helmholtz International School-Workshop 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, Mellin-Barnes 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]
  
  

Ph.D Students:

• J. Ussovitsch, at Humboldt-Universität zu Berlin, starting November 2014. Co-supervisor: Prof. P. Uwer
  
• I. Dubovyk, at Universität Hamburg, starting October 2014. Co-supervisor: Prof. S. Moch
  
• Dr. V. Yundin, Ph.D. Thesis (Humboldt-Universität zu Berlin 2012): "Massive loop corrections for collider physics". Co-supervisor: Prof. J. Plefka
  
• Dr. A. Lorca, Ph.D. Thesis (Universität Bielefeld 2005): " Calculation and automation of one-loop corrections to 2 to 2 fermion processes". Co-supervisor: Prof. J. Fleischer
  
• Dr. M. Jack, Ph.D. Thesis (Humboldt-Universität zu Berlin 2000): "Semi-analytical calculation of QED radiative corrections to e+e- -> f(bar)f with special emphasis on kinematical cuts to the final state". Co-supervisor: Prof. M. Müller-Preussker
  
• Dr. J. Biebel, Ph.D. Thesis (Humboldt-Universität zu Berlin 2001): "Predictions for the search for anomalous couplings of gauge bosons and leptons in e+e- scattering". Co-supervisor: Prof. D.Lüst
  
• Dr. D. Lehner, Ph.D. Thesis(Humboldt-Universität zu Berlin 1995) " Initial state radiative corrections to Z0 pair production in e+e- annihilation: The Semianalytical approach". Co-supervisor: Prof. M. Müller-Preussker

Diploma Students:

• F. Haas, Diploma thesis (Universität Potsdam 2008): "Application of Mellin-Barnes representations to the evaluation of radiative loop diagrams in Bhabha scattering". Co-supervisor: Prof. M. Wilkens
  
• A. Krüger, Diploma thesis (Humboldt-Universität zu Berlin 1998): "Vorhersagen für Effekte schwerer neutraler Eichbosonen am ep-Beschleuniger HERA". Co-supervisor: Prof. D. Ebert
  

2014 First Prize of the Joint Institute for Nuclear Research, Dubna

2001 First Prize of the Joint Institute for Nuclear Research, Dubna

An old story: LFV Z decays

Some Fortran programs:

1. ZFITTER - A Program for the Semi-Analytic 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 http://zfitter.education. See: The ZFITTER homepage (25 June 2014), DOI:10.3204/zfitter.education
   Since 2012, there is no institutional ZFITTER support. In case of need, please contact spokesperson@zfitter.education.
   The last released version is ZFITTER v.6.43.
   Numerically, it is identical to ZFITTER v.6.42, distributed via the software deposit of "Computer Physics Communications".
   The actual version is ZFITTER v.6.44beta.
   For an overview see the article "The ZFITTER Project", in Physics of Particles and Nuclei, 2014, Vol. 45, No. 3, pp. 529-549. DOI: 10.1134/S1063779614030022. © Pleiades Publishing, Ltd., 2014
   Further information:
   Gfitter01: previous code version (DESY, Bereich High Energy Physics, 25 June 2013)
   Fall ZFITTER/Gfitter - Stellungnahme DESY Direktorium zum Fall ZFITTER/GFitter (Helmut Dosch, Christian Scherf, 22 March 2014)
   http://sanc.jinr.ru/users/zfitter - Webpage of the ZFITTER Collaboration at JINR, Dubna, Russia

2. topfit - A Program for the Semi-Analytic Calculation of Predictions for the Process e+e- -> t bar-t (+ photon)
   Authors: J. Fleischer, A. Leike, T. Riemann, A. Werthenbach
   preprint DESY 02-204, March 2003
   e-Print Archive: hep-ph/0302259
   Click here for the DESY, Zeuthen topfit homepage
   
   
3. GENTLE/4fan - A Program for the Semi-Analytic 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) 161-187
   preprint DESY 96-233, December 1996
   e-Print Archive: hep-ph/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
   
   
4. Predictions for Anomalous tau+ tau- gamma Production at LEP 1
   Authors: Jochen Biebel and Tord Riemann
   Published in Z. Phys. C76 (1997) 53-58
   preprint DESY 96-212, October 1996, 13pp.
   e-Print Archive: hep-ph/9610437
   Click here for the program: anotau.f

5. 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) 128-184, hep-ph/9511434 DESY 95-185
   Source code
   Additional applications are possible with v.1.11; see:
   DESY 96-189 (spin physics)
   DESY 96-213 (tagged photons)
   New beta version of the source code

6. 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 94-125 [hep-ph/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.