particle physics

For the first time, scientists have observed how molecules change direction after slow collisions with atoms. Researchers from Radboud University and the FOM Foundation allowed molecules to collide with atoms very slowly. This enabled them to zoom in on the dynamics of a collision for the first time. How do the initial conditions of particles… Read more

Explainer: What Is Mass?

When it comes to electrons, Higgs bosons or photons, they don’t have much going for them. They possess spin, charge, mass and … that’s about it. Sometimes they only carry a vanishing amount of some of these features at that. So the mass of a particle is an important property to understand, because it goes… Read more

Conventional particle accelerators are typically gigantic machines that occupy a lot of space. Even at more modest energies, such as that used for cancer therapy and medical imaging, accelerators need large rooms to accommodate the required hardware, power supplies and radiation shielding. But a new discovery by physicists at the University of Maryland could hold… Read more

Peering at the debris from particle collisions that recreate the conditions of the very early universe, scientists have for the first time measured the force of interaction between pairs of antiprotons. Like the force that holds ordinary protons together within the nuclei of atoms, the force between antiprotons is attractive and strong. The experiments were… Read more

A series of experiments conducted recently at two of the most powerful particle colliders in the world—the Large Hadron Collider (LHC) and the Relativistic Heavy Ion Collider (RHIC)—addressed the question: How small can a droplet shrink and remain a liquid? Both colliders smash various atomic particles together at nearly the speed of light and have… Read more