Scientists at Johannes Gutenberg University Mainz (JGU) have set a new record for the calculation of scattering amplitudes. This kind of calculation is used to predict the outcome of accelerator experiments in which high-energy particles collide with one another.
This Feynman diagram illustrates the collision between an electron and positron (left), with their annihilation and the formation of a quark, an anti-quark, and five gluons (right).
Ill.: THEP, Mainz
However, the calculations become increasingly difficult the greater the number of orders the physicists wish to calculate. Professor Dr. Stefan Weinzierl's work group has now developed an algorithm which is far faster and requires less computing capacity than other algorithms. "We have made a huge leap forward and applied a completely new method allowing us to calculate far more than before," explains Weinzierl. He assumes that the new calculation method can be applied to both completed experiments in the Large Electron-Positron Collider (LEP), which was in operation at Geneva's CERN research center until the year 2000, as well as new experiments in the Large Hadron Collider (LHC).
The new algorithm allows, for instance, for the calculation of physical observables related to the collision of an electron with its antiparticle, the positron, during which a quark, an anti-quark, and gluons are created. For the first time ever, it has been possible to do a calculation with one loop and eight external particles – a new world record in theoretical high-energy physics.
Precision calculations in particle physics make use of the perturbation theory and the results can be displayed in what are called loop diagrams. The higher the number of external particles, the more difficult is the calculation. The algorithm now being used is a new and efficient method based on subtraction and numerical integration. The calculations are performed using a PC cluster system located at the Center of Data Processing at Mainz University. According to Weinzierl, the new method is not only applicable to electron-positron annihilation, but with slight modifications can also be used to calculate hadron-hadron collisions of the kind that occur in the LHC in Geneva. The theoretical physicists at Mainz University intend to investigate this aspect further in the near future.
Professor Dr. Stefan Weinzierl's work is part of the JGU Excellence Cluster Precision Physics, Fundamental Interactions and Structure of Matter (PRISMA). The cluster has made it into the final selection round of Germany's Federal Excellence Initiative and has submitted a proposal for continued financing in the second round.
Petra Giegerich | idw
Innovative LED High Power Light Source for UV
22.06.2017 | Omicron - Laserage Laserprodukte GmbH
Spin liquids − back to the roots
22.06.2017 | Universität Augsburg
Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.
Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...
Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.
As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...
Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.
With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...
Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine
Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...
Germany counts high-precision manufacturing processes among its advantages as a location. It’s not just the aerospace and automotive industries that require almost waste-free, high-precision manufacturing to provide an efficient way of testing the shape and orientation tolerances of products. Since current inline measurement technology not yet provides the required accuracy, the Fraunhofer Institute for Laser Technology ILT is collaborating with four renowned industry partners in the INSPIRE project to develop inline sensors with a new accuracy class. Funded by the German Federal Ministry of Education and Research (BMBF), the project is scheduled to run until the end of 2019.
New Manufacturing Technologies for New Products
19.06.2017 | Event News
13.06.2017 | Event News
13.06.2017 | Event News
22.06.2017 | Life Sciences
22.06.2017 | Materials Sciences
22.06.2017 | Materials Sciences