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
• 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 08/2009 Spokesperson of Theory Group, DESY, Zeuthen
• Since 2003 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"
  Past:
  
• 9/1993-8/1995, 4/2004-4/2008 Spokesperson of Theory Group, DESY, Zeuthen
• 8/2000-7/2004 Node coordinator of TMR Network (RTN) of the European Commission: "Particle Physics Phenomenology at High Energy Colliders"

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" - since 1992 (even years), in 2008: LL 2008
• DESY School CAPP: "Computer Algebra and Particle Physics" - since 2005 (odd years), in 2009: CAPP 2009

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:

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

   
   

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.