CERN

The Large Hadron Collider (LHC), the largest and most powerful particle accelerator ever built, is ready to renter service after a three-year overhaul and refit. On April 22, two proton beams were sent around the the 27-kilometer-long ring.

Physicists at CERN have discovered that antimatter falls down. It sounds obvious, but scientists hadn’t yet been able to confirm that it responds to gravity in the same way as regular matter does. A new experiment provides the best answer so far.

CERN physicists have measured the life of the Higgs boson with greater accuracy than ever before. Since the legendary particle only lives for a tiny fraction a second, the scientists came up with a creative workaround to calculate the new figure.

Physicists have detected “ghost particles” in the Large Hadron Collider for the first time. An experiment called FASER picked up signals of neutrinos being produced in particle collisions, which can help scientists better understand key physics.

Normal matter has an “evil twin” that annihilates on contact, and despite decades of study antimatter remains very mysterious. So what actually is it? Where is it? Why is it important to understand? And why hasn’t it already destroyed the universe?

Antimatter is hard to study, not least because it annihilates any container you try to put it in. Now CERN physicists have developed a new antimatter trap that can cool samples in seconds, which could help unlock a fundamental mystery of the universe.

Physicists at CERN have discovered an exotic new particle that’s quite charming. Known as Tcc+, the particle belongs to a rare class called tetraquarks, and its unusual composition makes it the longest-lived exotic hadron found so far.

A subatomic particle has been found switching between matter and antimatter, in Large Hadron Collider data. It turns out an unfathomably tiny weight difference between two particles could have saved the universe from annihilation soon after it began.

Why is the expansion of the universe accelerating? The leading hypothesis is a repellent force that astrophysicists refer to as “dark energy." But how does it work? What does it mean for our future? And how sure are we that it even exists?

Scientists at CERN have used lasers to cool down antimatter for the first time. The milestone could help unlock some of the secrets of this weird substance, including why it didn’t annihilate the universe soon after the Big Bang.

In a move that would please the fictional Star Trek engineer Mr. Scott, CERN is working on ways to store and transport antimatter. This isn't to power any starships secretly under construction, but as a way to better study antiprotons.

CERN’s Large Hadron Collider probes the fringes of known physics, and now the facility has found particles not behaving as predicted. While it’s early days, the discovery hints at the existence of new particles or forces beyond the Standard Model.