Elementary Particle Physics

(Copyright: Institute of Physical Chemistry, Universität Heidelberg)

HPC technologies have helped researchers reach new frontiers in understanding how our physical world functions on the most fundemental level. Modelling and simulation enable researchers to study subatomic particle interactions in nanosecond detail, allowing for the development of new materials and technologies.

The following is a list of recent reports submitted by users of HLRS's high-performance computing systems describing their scientific interests and research results.

Click on each title for a more detailed report. The complete reports are found on the website of the Gauss Centre for Supercomputing (GCS), the alliance of Germany's three national supercomputing centers.

Hadronic Contributions to the Anomalous Magnetic Moment of the Muon from Lattice QCD
The Standard Model of Particle Physics is a highly successful theoretical framework for the treatment of fundamental interactions, but fails to explain phenomena such as dark matter or the abundance of matter over antimatter. Precision observables, such as the anomalous magnetic moment of the muon, aμ, play a central role in the search for “New Physics”. A promising hint is provided by the persistent tension of 3.7 standard deviations between the theoretical estimate for aμ and its experimental determination. In our project we employ the methodology of lattice QCD to compute the hadronic contributions to aμ from first principles. In the long run, our results will supersede the estimates based on data-driven approaches and hadronic models.
Principal Investigator: Hartmut Wittig
Affiliation: Institute for Nuclear Physics and PRISMA Cluster of Excellence, Johannes Gutenberg University of Mainz

Hadron Scattering and Resonance Properties from Lattice QCD
It is a long lasting dream in nuclear physics to study nuclei like, for instance, carbon directly from Quantum Chromodynamics (QCD), the underlying fundamental theory of strong interactions. Such an endeavor is very challenging both, methodically and numerically. Towards this goal physicists from the European Twisted Mass Collaboration and in particular the University of Bonn have started to investigate two hadron systems using the approach of Lattice QCD.
Principal Investigator: Carsten Urbach
Affiliation: Helmholtz Institut für Strahlen und Kernphysik (Theorie), Rheinische Friedrich-Wilhelms-Universität Bonn (Germany)

Nucleon Properties from First Principles
Nucleons make up more than 99% of the mass of ordinary matter. Computing their properties from first principles, i.e. the theory of Quantum Chromodynamics, is complicated by the non-linear nature of the underlying equations. Only by using supercomputers can we attempt to compute these quantities with the necessary precision. Beyond shedding light on the nature of the nucleons, the results help to resolve some long-standing puzzles in nucleon structure physics and restrict possible models of physics beyond the Standard Model.
Principal Investigator: Dr. Stefan Krieg
Affiliation: Forschungszentrum Jülich, Institute for Advanced Simulation, Jülich Supercomputing Centre

Hadronic Corrections to the Muon Anomalous Magnetic Moment
Supercomputing resources are used to investigate a long standing discrepancy between theoretical calculation and experiment in the case of an elementary particle called muon. This muon magnetic moment puzzle is considered by many as a smoking gun for new physics, ie. something that cannot fit into the current framework of particle physics.
Principal Investigator: Kálmán Szabó
Affiliation: Forschungszentrum Jülich GmbH (Germany)