Under a partnership between a team of UC San Diego physicists and the Open Science Grid (OSG), a multi-disciplinary research partnership funded by the U.S. Department of Energy and the National Science Foundation, Gordon has been providing auxiliary computing capacity by processing massive data sets generated by the Compact Muon Solenoid, or CMS, one of two large general-purpose particle detectors at the LHC used by researchers to find the elusive Higgs particle.
“This exciting project has been the single most data-intensive exercise yet for Gordon since we completed large-scale acceptance testing back in early 2012,” said SDSC Director Michael Norman, who is also an astrophysicist involved in research studying the origins of the universe. “I’m pleased that we were able to make Gordon’s capabilities available under this partnership between UC San Diego, the OSG, and the CMS project.”
The around-the-clock data processing run on Gordon was completed in about four weeks’ time, making the data available for analysis several months ahead of schedule. About 1.7 million core hours – or about 15% of Gordon’s total compute capacity - were dedicated to this task, with more than 125 terabytes of data streaming through Gordon’s nodes and into SDSC’s Data Oasis storage system for further analysis. Just one terabyte of data, or one trillion bytes, equals the information printed on paper made from 50,000 trees.
“Access to Gordon, and its excellent computing speed due to its flash-based memory, really helped push forward the processing schedule for us,” said Frank Wuerthwein, a professor of physics at UC San Diego and a member of the CMS project. “With only a few weeks’ notice, we were able to gain access to Gordon and complete the runs, making the data available for analysis in time to provide crucial input toward international planning meetings on the future of particle physics.”
“Giving us access to the Gordon supercomputer effectively doubled the data processing compute power available to us,” added Lothar Bauerdick, OSG’s executive director and the U.S. software and computing manager for the CMS project. “This gives CMS scientists precious months to get to their science analysis of the data reconstructed at SDSC.”
The UC San Diego-OSG collaboration comes as the LHC was shut down in February 2013 to make numerous upgrades during the next two years. One major activity during the shutdown includes the development of plans for efficient, effective searches once the LHC is back in operation. To do that – and to have time enough to upgrade equipment – researchers must also sift through massive amounts of stockpiled data to help define future research agendas.
“Unfortunately, the shutdown schedule meant that the parked data would not be available for analysis this summer, and possibly not even for deriving meaningful contributions to planning documents for future upgrades of the experiment that are due this fall,” explained Wuerthwein.
The Hunt for Dark Matter
With the recent discovery and later confirmation in March of the Higgs boson – the last missing piece of the standard model of particle physics – scientists are now setting their sights on discovering new physics beyond the standard model. The next big thing is to search for dark matter, according to Wuerthwein.
“For the Higgs, we knew exactly how to search for it given theoretical predictions based on past experimental results,” said Wuerthwein, who is heading up the search for dark matter for the entire CMS team. “For dark matter, the situation is much more hazy. We hope to produce dark matter at the LHC in cascade decays of a whole spectrum of new fundamental particles, the lowest mass of which is dark matter. But the details of this spectrum of masses are unknown. To have sensitivity to a larger range of possible mass spectra, we needed to write more data to tape so we would be able to carefully analyze it later.”
The origin of this spectrum of new fundamental particles is a new kind of symmetry of nature called Supersymmetry, or SUSY. “Underlying this symmetry is a fascinating but theoretical conjecture with little to no physical evidence so far,” noted Wuerthwein. “It's fascinating because it could provide an ordering principle that allows for all known physical forces to be unified during the earliest times of the ‘Big Bang’ or birth of the universe, while providing an explanation for dark matter, and resolving some of the outstanding questions about details of the Higgs mechanism and mass.”
UC San Diego researchers and CMS team members, in addition to Wuerthwein, include Jim Branson, Vivek Sharma, and Avi Yagil, all of whom played major roles in the discovery of the Higgs particle and will continue to make meaningful contributions to future related research.
“UC San Diego has been one of the most successful institutions in the global hunt for the Higgs particle discovery at the LHC,” said Wuerthwein, who is leading the university’s search for dark matter.
Wuerthwein and his colleagues will present additional details of the CMS collaboration at the 20th International Conference on Computing in High Energy and Nuclear Physics (CHEP) to be in Amsterdam, The Netherlands October 14-18, 2013. More about UC San Diego’s role in the quest to find the Higgs particle can be found at http://physicalsciences.ucsd.edu/higgs/
Jan Zverina | Newswise
A 100-year-old physics problem has been solved at EPFL
23.06.2017 | Ecole Polytechnique Fédérale de Lausanne
Quantum thermometer or optical refrigerator?
23.06.2017 | National Institute of Standards and Technology (NIST)
An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.
Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...
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)...
19.06.2017 | Event News
13.06.2017 | Event News
13.06.2017 | Event News
23.06.2017 | Physics and Astronomy
23.06.2017 | Physics and Astronomy
23.06.2017 | Information Technology