After a search that has lasted roughly three-quarters of a century, researchers believe they have at long last discovered evidence of an elusive particle that could be its own anti-particle.

An international collaboration of scientists has reported a landmark calculation of the decay process of a kaon into two pions, using breakthrough techniques on some of the world's fastest supercomputers.

New research adds doubt that a prominent European astrophysics experiment may have found evidence of dark matter.

Why there is stuff in the universe—more properly, why there is an imbalance between matter and antimatter—is one of the long-standing mysteries of cosmology.

A simple atomic nucleus could reveal properties associated with the mysterious phenomenon known as time reversal and lead to an explanation for one of the greatest mysteries of physics: the imbalance of matter and antimatter in the universe.