Tord Robert Riemann
Tord Robert Riemann (* 1951 in Berlin ) is a German theoretical physicist who mainly works in the field of quantum field theory and the investigation of the standard model of elementary particles with accelerators.
Origin and life
Tord Riemann grew up in Berlin. His parents are the lawyer Tord Hugo Riemann (1925–1992) and the television dramaturge Käthe Riemann . He has two siblings. His grandfather, the teacher, historian and humanist Robert Riemann (1877–1962) wrote memoirs. Some biographical master data can be found in the pedigree of the great-grandfather, the musicologist Hugo Riemann .
From 1967 to 1970 Tord Riemann attended the Heinrich-Hertz special school for mathematics in Berlin. After graduating from high school, he studied at the Physics section of the Humboldt University in Berlin from 1970 to 1977 , most recently as a research student.
Riemann has been married to the physicist Sabine Riemann since 1972 and has two children. He lives in Königs Wusterhausen near Berlin and on Usedom .
Activity as a scientist
Riemann received his doctorate in 1977 at the Humboldt University of Berlin (HUB) under the supervision of Hans Jürgen Kaiser ( Institute for High Energy Physics (IfH) of the Academy of Sciences of the GDR (AdW), Zeuthen ) and Frank Kaschluhn (professor at the physics section of the HUB and Head of the Quantum Theory Working Group at the IfH). The topic dealt with a problem of quantum field theory on the grid. Riemann has been working in the theory group at the Zeuthen Research Institute since 1977. After the AdW was dissolved, the IfH was re-established on January 1, 1992 as the Zeuthen campus of DESY .
From 1977 onwards, Riemann worked for several years, together with Max Klein and others, on predictions of interference effects of electromagnetic and weak interactions in muon-nucleon scattering. These were later detected in the NA4 experiment at CERN's Super Proton Synchrotron (SPS) accelerator . Since the early 1980s he has been studying the formalism and applications of loop effects in electroweak theory.
Riemann was not intended for direct cooperation with western research institutions. He took the opportunity of a delegation from September 1983 to August 1987 to the theory laboratory of the United Institute for Nuclear Research VIK in Dubna , Russia and worked there with the research group of Dmitri Bardin .
Since the fall of the Wall in 1989, Riemann has also been able to cooperate directly with colleagues at CERN and DESY . From September 1991 to August 1992 he worked as a scientific associate in the theory group at CERN. On January 1, 1992, he became a member of the newly founded Zeuthen theory group at DESY. He was the group's spokesperson from 1993–1995, 2004–2008 and 2009–2011.
Riemann has worked on numerous projects aimed at predicting measured variables on accelerators. He belongs to the generation of theorists who brought the computation and phenomenological application of radiation corrections of elementary particle theory to bloom.
In 1985 he co-founded the international ZFITTER project with Arif Akhundov , Dmitri Bardin and Oleg Fedorenko (1951–1994) and has been the collaboration's spokesperson since 2005. ZFITTER is a theory and software project for the precise description of the Z boson resonance, including all known corrections of higher orders of perturbation theory. The mass and lifetime of the Z boson of the standard theory of elementary particles and the number of neutrino generations were determined using ZFITTER at the electron-positron accelerator LEP at CERN. To this day, the program is the theoretical standard for Z boson physics. It was also used for the LEPEWWG prediction of the masses of the top quark and Higgs boson before their discovery.
HECTOR, a similar theory and software project for experiments on deep inelastic electron-proton scattering at the HERA accelerator at DESY, Hamburg, is still used as a benchmark today. Riemann carried out numerous first calculations of observables in standard electroweak theory. The following may be mentioned: Flavor-damaging Z boson decays; Lifetimes of the Z and W bosons; Complete electro-weak single-loop corrections to the Z boson resonance curve and to the deeply inelastic lepton nucleon scattering; S matrix access to the Z boson resonance curve; Loop corrections from heavy particles to bhabha scattering . He is co-author of various open source software packages based on these calculations.
In recent years, together with Jochem Fleischer (former professor at Bielefeld University, 1937–2013) and Janusz Gluza (professor at the Silesian University in Katowice), he has dealt with new techniques for calculating complicated Feynman integrals that are used to determine of higher orders of quantum field perturbation theory are required. A wide variety of one- and two-loop calculations for multi-particle production at high-energy accelerators are possible, but also two-loop calculations for the Z boson resonance.
Riemann is the author of numerous publications.
Teaching and Cooperations, Good Scientific Practice
Since 1993, Riemann has been a regular co-applicant of European research and training networks, graduate schools and a special research area / transregio.
Riemann has supervised several doctoral theses in cooperation with Bielefeld University, the HUB and the University of Hamburg (UHH).
He has given numerous lectures at international schools and since 2006 lectures in Potsdam and Dresden on the standard model and its applications in high-energy physics. He is currently reading at DESY, Zeuthen Campus.
Riemann was a co-founder in 1992 and has been the organizer of the Loops and Legs in Quantum Field Theory conference series for many years .
Together with Sven-Olaf Moch (Professor at the University of Hamburg) he heads the doctoral school CAPP - Computer Algebra in Particle Physics, which they founded in 2005 .
Since the ZFITTER collaboration found that its software was plagiarized in March 2011, Riemann has been researching how to deal with plagiarism in particle physics. The disclosure of plagiarism has not yet led to the consequences that the German academic system prescribes in accordance with the traditions of international academic basic research.
Awards
In 1968 Riemann received a 3rd prize at the VII Mathematics Olympiad in the GDR. First and second prizes were not awarded.
In 1978 Riemann was awarded the Heinrich Gustav Magnus Prize of the Humboldt University of Berlin , Physics section, for his dissertation “Green's functions of fermions in the case of strong coupling using functional integration” .
Riemann received the Institute Prize of the Institute for High Energy Physics twice: 1979 for work on the subject of “Deeply inelastic muon-nucleon interaction and neutral currents” and in 1989 for the work “The Z-boson line shape at LEP” and “Z-boson line shape and sin²θ ".
In 1984, Riemann received the Socialist Labor Activist award for his contributions to predicting the asymmetry of the interaction of polarized positive and negative muons with nucleons. This asymmetry was proven in 1983 by the BCDMS collaboration at CERN.
In 2000, Riemann was awarded the JINR Prize in Theoretical Physics for the ZFITTER project.
In 2014 the article “The ZFITTER Project” was awarded the prize of the Joint Institute for Nuclear Research, Dubna, Russia for the best publication of the year in “Physics of Elementary Particles and Nuclei”.
In 2015 he received the Polish Alexander von Humboldt Prize for his work and cooperation with Polish colleagues. The award is linked to a research stay with the host Janusz Gluza (professor at the Silesian University in Katowice ).
Web links
- Homepage of Tord Riemann at DESY
- Tord Riemann's private homepage
- Overview of Tord Riemann's publications on particle physics: Spiers search
Individual evidence
- ^ Robert Riemann, Stupidity and Insight in Eighty Years of Life (1877–1957) , autobiography, edited by Tord R. Riemann, Königs Wusterhausen, 2015, ISBN 978-3-00-050665-9 (e-book). Reprint of individual chapters: Website Professor Dr. Robert Riemann
- ↑ Hugo Riemann website
- ↑ Guest website: https://hugo-riemann.de/kaiser/ , accessed on January 19, 2020
- ↑ Hans Jürgen Kaiser in the INSPIRE physics database, accessed on April 7, 2016
- ↑ Frank Kaschluhn , FK, continued. in the INSPIRE physics database, accessed on April 7, 2016
- ↑ NA4 experiment at the PS accelerator at CERN has proven the weak neutral current
- ^ ZFITTER website at JINR, Dubna, Russia
- ↑ LEP Electroweak Working Group Website
- ↑ The so-called Blue Band Plot ( memento of the original from March 18, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. the LEPEWWG 2008 was made with ZFITTER (Version 6.43). It is quoted in Scientific Background on the Nobel Prize in Physics 2013: The BEH-Mechanism, Interactions with Short Range Forces and Scalar Particles , page 16, advanced-physicsprize2013
- ↑ Fortran program HECTOR , accessed on April 3, 2016
- ↑ Guest website: https://hugo-riemann.de/tord/doc/Jochem_Fleischer/ , accessed on January 19, 2020
- ↑ Website: http://prac.us.edu.pl/~gluza/ , accessed on January 19, 2020
- ↑ Website Tord Riemann at DESY, https://www-zeuthen.desy.de/~riemann/
- ↑ Publications by Tord Riemann in the spires database
- ↑ PhD students of Dr. T. Riemann
- ↑ http://www-zeuthen.desy.de/~riemann/ Homepage of Tord Riemann at DESY
- ↑ http://loopsandlegs.desy.de/ "Loops and Legs" conferences
- ↑ CAPP 2013
- ^ ZFITTER website at JINR, Dubna, Russia
- ^ F. Carminati, D. Perret-Gallix, T. Riemann, "Summary of the ACAT 2013 Round Table Discussion: Open-source, knowledge sharing and scientific collaboration", Beijing, Japan, http://arxiv.org/pdf/ 1407.0540.pdf , J. Phys. Conf. Ser. 523 (2014) 012066 and DESY publication DESY-14-079
- ↑ U. Beisiegel u. a., Memorandum of the DFG: Safeguarding Good Scientific Practice , Recommendations of the Commission "Self-Control in Science", Print- ISBN 978-3-527-33703-3 , 1998, first edition, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2013, supplemented edition, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
- ↑ H. Dosch and C. Scherf, DESY website: DESY Directorate Statement on the ZFITTER / GFitter case (March 22, 2014, accessed on March 3, 2016)
- ↑ A. Argento et al. a., "Electroweak asymmetry in deep inelastic muon-nucleon scattering", Phys. Lett. 120B (1983) 245. doi: 10.1016 / 0370-2693 (83) 90665-2
- ↑ First Prize in Theoretical Physics of the Joint Institute for Nuclear Research JINR for "Theoretical support of experiments at the Z resonance on precision tests of the standard model (Project ZFITTER)", http://ftp.jinr.ru/jinr/Prize- 2000-e.htm
- ↑ A. Akhundov (Baku), A. Arbuzov (Dubna), S. Riemann and T. Riemann (Königs Wusterhausen), "The ZFITTER project", Phys. Part. Nucl. (PEPAN, Springer Verlag) 45 (2014) 529-549, doi: 10.1134 / S1063779614030022 , arxiv : 1302.1395
- ↑ http://pepan.jinr.ru/pepan/eng/winners/
- ↑ The laureates of the Polish Alexander von Humboldt Prize 2015: http://www.fnp.org.pl/en/typendia-im-a-von-humboldta-przyznane-konkurs-2015/
- ↑ DESY announcement ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. for the Polish Humboldt Prize
| personal data | |
|---|---|
| SURNAME | Riemann, Tord Robert |
| BRIEF DESCRIPTION | German theoretical physicist |
| DATE OF BIRTH | 1951 |
| PLACE OF BIRTH | Berlin |