TRR 9:  Computational Particle Physics

• Subject Area: Physics
• Term: from 2003 to 2014
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 5485680

During the past years Computational Physics has developed into an independent discipline within physics. Theoretical particle physics was and still is one of those fields which rely heavily on computer assisted techniques. The two most prominent examples in this connection are the numerical simulation of quantum field theories on discretised space time - lattice gauge theory - which is closely connected with the investigation of phase transitions in statistical mechanics, and the extensive application of computer algebra for the evaluation of scattering amplitudes in perturbative quantum field theory. The rapid development of powerful computers has opened qualitatively new possibilities which are being developed and applied in the newly founded Transregio Collaborative Research Centre.
Including dynamical fermions in simulations of lattice gauge theories will for the first time allow realistic comparisons between measurements and theoretical predictions for transition matrix elements and hadron spectra. The perturbative treatment of quantum field theory with the help of extensive use of computer algebra allows to perform highly complex calculations and to arrive at predictions with unprecendented accuracy.
To achieve these goals there are three sections which include project leaders from the three locations Aachen, Berlin-Zeuthen and Karlsruhe with expertise in perturbative quantum field theory and computer algebra, lattice gauge theory and flavour dynamics.
Section A "Perturbative Methods and Lattice Simulation in Quantum Field Theory" is mainly concerned with conceptual developments. This includes development of new methods for the evaluation of Feynman integrals, the design of parallelised computer algebra and the development of perturbative methods for lattice gauge theory.
These investigations lay the foundations for "Predictions for Reactions at High Energies" and calculations for "Heavy Quarks and Flavour Physics", the central topics of Sections B and C. Section B is mainly concerned with calculations relevant for the colliders LHC at CERN and TESLA which are either under construction or in their late phase of design. Section C is mainly concerned with production and decays of top and bottom quarks in view of the presently operation B-meson factories and the plans for top quark production at the future linear collider TESLA.

• DFG Programme: CRC/Transregios

Completed projects

• A1 - Multiloop-Rechnungen, Computeralgebra und phänomenologische Anwendungen (Project Heads Beneke, Martin ;  Kühn, Johann )
• A01 - Multiloop Calculations and Computer-Algebraic Techniques in Quantum Field Theory (Project Head Kühn, Johann )
• A02 - Parallelization of algebraic program systems (Project Heads Kühn, Johann ;  Steinhauser, Matthias )
• A03 - Effiziente Techniken für Störungsrechnung auf dem Gitter (Project Heads Kühn, Johann ;  Wolff, Ulrich )
• A04 - Chirally Invariant and Twisted Mass Formulations of QCD on the Lattice (Project Heads Jansen, Karl ;  Müller-Preußker, Michael )
• A05 - Automated NLO/NLL Monte Carlo programs for the LHC (Project Heads Czakon, Michal ;  Krämer, Michael )
• B01 - Precision predictions for massive particle production (Project Heads Czakon, Michal ;  Moch, Sven-Olaf ;  Riemann, Tord )
• B02 - Lattice computation of input parameters of perturbative QCD (Project Head Wolff, Ulrich )
• B03 - Parton distribution functions on the lattice and in the continuum (Project Heads Bluemlein, Johannes ;  Jansen, Karl )
• B04 - Production of unstable particles (Project Head Beneke, Martin )
• B05 - Precision calculations for Higgs and BSM physics at the LHC (Project Heads Krämer, Michael ;  Mühlleitner, Milada Margarete ;  Zeppenfeld, Dieter )
• C01 - Strong interaction effects in B meson decays (Project Heads Beneke, Martin ;  Sommer, Rainer )
• C03 - Threshold production of top-quark pairs and other heavy particles (Project Heads Beneke, Martin ;  Steinhauser, Matthias )
• C04 - Top-quark physics at colliders (Project Heads Bernreuther, Werner ;  Moch, Sven-Olaf ;  Uwer, Peter )
• C05 - Multi-loop calculation with heavy fermions in the SM and MSSM (Project Heads Mihaila, Luminita Nicoleta ;  Steinhauser, Matthias )
• C06 - Theoretische Elementarteilchenphysik, Flavourphysik, Supersymmetrie (Project Heads Beneke, Martin ;  Nierste, Ulrich )
• Z - Central tasks of the Transregional Collaborative Research Centre (Project Heads Beneke, Martin ;  Krämer, Michael )

• Applicant Institution: Rheinisch-Westfälische Technische Hochschule Aachen
• Co-Applicant Institution: Karlsruher Institut für Technologie (KIT) ; Campus Süd (aufgelöst); Humboldt-Universität zu Berlin
• Participating Institution: Deutsches Elektronen-Synchrotron (DESY); Standort Zeuthen
• Spokespersons: Professor Dr. Martin Beneke, until 3/2012; Professor Dr. Michael Krämer, since 4/2012