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
UNH scientists help provide first-ever views of elusive energy explosion
16.11.2018 | University of New Hampshire
NASA keeps watch over space explosions
16.11.2018 | NASA/Goddard Space Flight Center
Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.
Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...
Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.
Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...
Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.
In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...
On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.
When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure
Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...
09.11.2018 | Event News
06.11.2018 | Event News
23.10.2018 | Event News
16.11.2018 | Health and Medicine
16.11.2018 | Life Sciences
16.11.2018 | Life Sciences