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Time ceaselessly speeds onward in our everyday experience, never taking so much as half a step backward. Now, thanks to experimental results from the BaBar collaboration, researchers can be sure that the same is also true for single, isolated particles... Continue reading →

ATLAS Control Room, Meyrin, Switzerland   11:30 p.m., Nov. 4 It is half an hour into the night shift at the control room for the Large Hadron Collider’s ATLAS detector, and there is nothing to do. The LHC is not running. “We can’t do anything.... Continue reading →

Scientists on an experiment at the Large Hadron Collider confirmed this week the existence of a particle-like structure first observed at the LHC’s predecessor, the Tevatron. Members of the CMS collaboration announced on Nov. 14 that they had spotted... Continue reading →

Neutrinos are among the most abundant particles in the universe, but they rarely interact with matter. Some of today’s outstanding scientific mysteries, such as why there is more matter than antimatter in the universe, could be solved by studying neu... Continue reading →

The universe is expanding, with every galaxy speeding away from all others at an ever-increasing rate. But it hasn’t always been that way. Eleven billion years ago, the speed of that expansion was beginning to slow as gravity pulled galaxies in towar... Continue reading →

The Large Hadron Collider is the product of generations of work. As time presses on, many LHC collaborators involved from the beginning have moved on to other projects, and memories of the decade of construction that produced the largest collider yet, ... Continue reading →

CMS physicists observed an unusual trend in the data they collected in September when they collided protons with lead ions instead of other protons. Particles produced in collisions tend to travel in opposite directions, but in one in roughly every 2 m... Continue reading →