CERN Halts 18-Year LHC Run for 4-Year Upgrade to 10x Brighter Successor

Q: After the Higgs boson, what is the next 'holy grail' discovery the supercharged Large Hadron Collider is hunting for?

After the Higgs boson, the High-Luminosity LHC’s main “holy grail” is evidence of physics beyond the Standard Model. In practice, that means the upgraded collider is hunting for signs of dark matter, new fundamental particles or forces, and precise deviations from Standard Model predictions that could reveal a deeper theory. CERN’s upgrade is aimed at producing about ten times more luminosity, giving physicists far more collisions and a better chance of catching extremely rare events. A major target is the Higgs itself. Scientists want much sharper measurements of how the Higgs interacts with other particles and with itself. If those measurements differ even slightly from Standard Model expectations, that could point to new physics. The Higgs is seen not just as a past discovery, but as a possible gateway to the next one. Another focus is unexplained anomalies in rare particle decays, especially in B-meson processes studied by LHCb. Those patterns have raised interest because they may hint at unknown particles such as leptoquarks or heavier Z-prime bosons, though no discovery has been confirmed. The broader scientific prize is to expose the Standard Model’s limits. It still cannot explain dark matter, gravity, why matter dominates over antimatter, or why neutrinos have mass. The supercharged LHC is being rebuilt to probe those cracks with much greater precision and, researchers hope, deliver the next breakthrough after the Higgs.

3 articles · Updated · Popular Science · Jul 5

June 29 marked the Large Hadron Collider’s entry into Long Shutdown 3, ending its current run after 18 years as CERN begins a major overhaul rather than a permanent shutdown.
Over the next four years, CERN plans to renovate the full complex, replace about 0.75 miles of magnets and other components, and rework facilities including the Super Proton Synchrotron and Experimental North Cavern 3.
The upgraded machine — the High-Luminosity LHC — is due to begin a gradual restart in 2028 and reach full operations in 2030.
At 10 times the current luminosity, the successor is designed to collect far more detailed particle data, extending studies of the Higgs boson and other unresolved questions in subatomic physics.

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Popular Science1d ago

CERN's Large Hadron Collider Enters "Long Shutdown 3" for Major Upgrades

sciencetimes.com1d ago

Large Hadron Collider Waves Goodbye As It Enters 'Long Shutdown 3' After Nearly 20 Years of Service

YouTube1d ago

Cern collider - scientists will spend the break analyzing the mountain of data already collected

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With a major physics anomaly now solved, could the LHC's massive upgrade end up discovering nothing new at all?

After the Higgs boson, what is the next 'holy grail' discovery the supercharged Large Hadron Collider is hunting for?

LHC’s Long Shutdown 3 (2026–2030): Preparing for the 10-Fold Luminosity Leap of the HiLumi LHC

Overview

On June 29, 2026, the Large Hadron Collider (LHC) began a planned four-year shutdown called Long Shutdown 3 (LS3), marking a major step toward its next phase: the High-Luminosity Large Hadron Collider (HiLumi LHC), set to launch in 2030. This extensive upgrade will transform the LHC into its most powerful form, dramatically increasing collision rates and data collection. As a result, scientists will gain unprecedented opportunities for discovery, ushering in a new era for high-energy physics and deepening our understanding of the universe’s fundamental mysteries.

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