![]() “The emphasis on large data sets brings major challenges to mitigate the radiation damage effects on the detectors, in particular the silicon pixels installed closest to the colliding beams,” Battaglia said. Battaglia has also been responsible for tuning the ATLAS pixel detector readout to compensate for the radiation damage incurred during the previous runs. Postdoctoral scholar Andrea Sciandra worked with Battaglia on new tracking algorithms that will improve the measurements of Higgs bosons, and he has been working in the ATLAS control room during start-up and commissioning for Run 3. “This is a major step forward, in particular for those studies probing the high energy frontier, such as new particle searches and, probably more importantly, measurements of Higgs boson properties that are basically limited by the number of available data events.” ![]() “The anticipated Run 3 data will almost triple the total data set on which our analyses are based,” Battaglia said. Marco Battaglia, adjunct professor of physics, has driven much of the work at SCIPP on Higgs measurements at high momentum, not only in the ATLAS analysis but also in phenomenological studies with a team of theorists to provide tools for an optimal interpretation of past and future results. “I’m excited about getting Higgs measurements at high momentum, which opens up a new avenue where we may be able to sense the presence of new particles through indirect effects, even though we can’t see them directly,” Nielsen said. In 2012, the ATLAS and CMS experiments confirmed the existence of the Higgs boson, which is crucial to understanding the origin of mass, and efforts continue to measure its properties with ever higher precision. More than 5,500 scientists from 245 institutes in 42 countries work on the ATLAS experiment, investigating a variety of unanswered questions about the universe. At the same time, we’re also building the next-generation detector, which won’t be installed until the next shutdown in 2026.”ĪTLAS is a general purpose detector designed to explore the widest possible range of physics phenomena. “We have to make sure it’s still reading out signals and tracking particles accurately. “The detector we built is still in there, and it’s a bit of a challenge to keep everything going even as components get radiation damage,” he said. SCIPP’s work has focused on the two innermost tracking layers, including the silicon sensors and readout electronics. The detector has multiple layers of devices to track and measure the jets of subatomic particles generated by high-energy collisions of proton beams within the LHC. UCSC physicists have been involved in the ATLAS project since the 1990s, said SCIPP Director Jason Nielsen. Putting all of those together gives us a really exciting opportunity to find new and unexpected things.” “The collaboration has been busy improving all aspects of the experiment over the past few years, and we’ll be able to extract more information than ever out of the new data, on top of increasing the size of the dataset and the energy of the collisions. “Run 3 is exciting for me not only because it will give us more data at higher collision energies, which we always love, but also because the detector is the best it’s ever been,” he said. Michael Hance, associate professor of physics at UCSC, will be the U.S. ![]() UC Santa Cruz physicists at the Santa Cruz Institute for Particle Physics (SCIPP) have been working on upgrades of the detector components in the ATLAS experiment, the largest of the particle detectors at the LHC. ![]() Run 3 of the LHC will feature higher-energy particle beams and higher collision rates, allowing physicists to collect more data than in the previous two runs combined.īased at CERN, the international particle physics lab in Geneva, Switzerland, the LHC has been in a long shutdown for maintenance and upgrades since December 2018. The Large Hadron Collider (LHC) restarted in April and is gearing up to probe new realms of physics during a third run, which will be its most powerful yet. ![]()
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