Dr. Tord Riemann

Contact:

• 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

Personalities:

• Since 1977 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 05/2005 spokesperson of the ZFITTER project, see also http://zfitter.com
• Since 2003 Project Leader in SFB/TRR 9 of DFG, project B1:
  "Precision calculations of massive particle production processes"
  Past:
  
• 08/2009-07/2011 Spokesperson of Theory Group, DESY, Zeuthen
• 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"
• 9/1993-8/1995, 4/2004-4/2008 Spokesperson of Theory Group, DESY, Zeuthen

Lehre:

Conferences and Advanced Schools:

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

• Conference "Loops and Legs in Quantum Field Theory"
  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
• CAPP - DESY School "Computer Algebra and Particle Physics"
  CAPP 2005, CAPP 2007, CAPP 2009, CAPP 2011

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
  
• See also the homepages on Ambre, Bhabha Scattering, DIANA_aITALC, ZFITTER, HECTOR

Publications:

Conference Talks and Lectures at Advanced Schools:

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:

• V. Yundin, at Humboldt University, Berlin, starting November 2007. 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
  

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, Zeuthen ZFITTER home page.
   The zfitter homepage has been relocated to zfitter.com.

   
   

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.