Particle physics

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.

Princeton physicists have accidentally discovered an unexpected quantum behavior in an insulator that was thought to be unique to metals. The find suggests a brand new type of quantum particle, which the team calls a neutral fermion.

Borexino, a huge underground particle detector in Italy, has picked up a never-before-seen type of neutrino coming from the Sun. These neutrinos confirm a 90-year-old hypothesis and complete our picture of the fusion cycle of the Sun and other stars.

Antimatter is a tricky substance to store and transport, mostly because it annihilates any container you try to put it in. Now CERN researchers have outlined a new antimatter trap designed to safely carry the volatile stuff to new facilities.

Scientists have so far been unable to detect dark matter. But a new detector design, using an array of billions of tiny pendulums, could finally break the silence by searching for the effects of dark matter’s incredibly strong gravitational pull.

Physicists in Germany have measured the shortest timespan ever recorded. The team measured the time it takes for a photon of light to travel the length of a hydrogen molecule, and found it to occur in just trillionths of a billionth of a second.

The Super-Kamiokande neutrino observatory in Japan has received an upgrade. A rare-earth element called gadolinium has been added to the water in the facility, which will make it more sensitive to neutrinos from more distant and ancient supernovae.

After a two-year shutdown for repairs and upgrades, CERN’s Large Hadron Collider is beginning to fire back up. The newest particle accelerator, Linac 4, completed its first test run over the past few weeks, and will produce much more powerful beams.

An extensive search for a hypothetical particle has turned up empty. The sterile neutrino is a proposed subatomic particle that could even be a candidate for the mysterious dark matter, but two new experiments have all but ruled it out.

There’s invisible, undetectable stuff all around us, and we call it dark matter. There’s plenty of evidence that this stuff is very real, but what exactly is dark matter? How do we know it’s there? And how are scientists looking for it?