The Large Hadron Collider has been reactivated today (July 5) and is ready to crush particles together at unprecedented energy levels.
He Large hadron collider (LHC) is the largest and most powerful particle accelerator in the world. Located in CERN near Geneva, Switzerland, the nearly 17-mile-long (27-kilometer) loop has been activated today after spending four years offline to upgrade. With these solutions completed, scientists want to use the giant accelerator to crush protons together at record energies of up to 13.6 trillion volts of electrons (TeV), an energy level that should increase the chances that the accelerator produce particles not yet observed by science. .
Upgrades to accelerator particle beams have done more than increase their energy range; a higher level of compactness, making the beams denser with particles, will increase the probability of a collision so much so that the accelerator is expected to capture more particle interactions in its third run than in the previous two combined. During the two previous periods, from 2009 to 2013 and from 2015 to 2018, the atom Smasher reinforced physicists’ understanding of how the basic blocks of matter interact, called the standard model – and led to the discovery of the prognosis Higgs bosonthe elusive particle that gives all matter its mass.
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But despite accelerator experiments, which produced 3,000 scientific papers on many minor discoveries and tempting clues to deeper physics, scientists have yet to find conclusive evidence for new particles or entirely new physics. After this update, expect this to change.
“We will measure the strength of Higgs boson interactions with matter and force particles to unprecedented accuracy, and advance our searches for Higgs boson decays by dark matter particles as well as searches for additional Higgs bosons, “LHC spokesman Andreas Hoecker said. ATLAS collaborationan international project that includes physicists, engineers, technicians, students and support staff, said in a statement (opens in a new tab).
Within the 17-mile-long underground ring of the LHC, protons move at almost the speed of light before colliding with each other. The result? New and sometimes exotic particles form. The faster these protons go, the more energy they have. And the more energy they have, the more massive the particles they can produce when crushed. Atomic breakers such as the LHC detect possible new particles looking for revealing decay products, as heavier particles usually have a short life and immediately decompose into lighter particles.
One of the goals of the LHC is to further examine the standard model, the mathematical framework used by physicists to describe all the fundamental particles known in the universe and the forces through which they interact. Although the model has been in its final form since the mid-1970s, physicists are far from satisfied with it and are constantly looking for new ways to test it and, if they are lucky, discover a new physics that the it will fail.
This is due to the fact that the model, despite being the most complete and accurate to date, has huge gaps, which make it completely unable to explain where the strength of gravity it comes from, what dark matter is made of or why there is so much more matter than antimatter in the universe.
While physicists want to use the improved accelerator to investigate the rules of the standard model and learn more about the Higgs boson, updates to the LHC’s four main detectors also leave it well positioned to look for physics beyond what it already is. they know. The LHC’s main detectors, ATLAS and CMS, have been updated to collect more than twice the data they did earlier in their new task of searching for particles that may persist in two collisions; and the LHCb detector, which now collects 10 times more data than before, will look for breaks in the fundamental symmetries of the universe and explanations for why the cosmos has more matter than antimatter.
Related: Physicists discover never-before-seen particles sitting on a table
Meanwhile, the ALICE detector will be put to work studying high-energy ion collisions, of which those recorded will be multiplied by 50 compared to previous tests. When crushed, ions, given atomic nuclei given electric charge by the removal of electrons from their orbital layer, produce a primordial subatomic soup called quark-gluon plasma, a state of matter that only existed during the first microsecond after the Big Bang.
In addition to these research efforts, a large number of smaller groups will investigate the roots of other mysteries of physics with experiments that will study the interior of protons; probes the behavior of cosmic rays; and look for the long-theorized magnetic monopoly, a hypothetical particle that is an isolated magnet with only one magnetic pole. To this are added two new experiments, called FASER (Forward Search Experiment) and SND (Scattering and Neutrino Detector), which were made possible by the installation of two new detectors during the recent shutdown of the accelerator. FASER will look for extremely light and weakly interacting particles, such as neutrinos and dark matter, and SND will look exclusively for neutrinos, ghostly particles that can travel through most matter without interacting with it.
One of the particle physicists who are especially excited to look for is the much sought after axion, a hypothetical strange particle that does not emit, absorb, or reflect light, and is a key suspect of what dark matter is made of.
This third run of the LHC is expected to last four years. After this time, the collisions will once again stop for new upgrades that will push the LHC to even greater power levels. Once upgraded and back into operation in 2029, the High Luminosity LHC is expected to capture data from the previous three executions combined 10 times.
Originally published in Live Science.