There are also particles called mesons, made of a quark and an antiquark. Since the 1960s, we have known that these particles violate the so-called charge-parity (CP) symmetry.

The magnetic moment of the muon—a tiny property of a tiny particle—has long puzzled physicists. Experiments and theory haven’t quite matched up, leaving open the thrilling possibility of discovering ...

Imagine two flashlights aimed at each other; do their beams collide? Nope! In everyday physics, light is too chill for drama.

They observe for the first time the decay of baryons, particles that make up the majority of the matter in the observable universe. After the Big Bang, matter and antimatter were created in equal ...

Usually, light waves can pass through each other without any resistance. According to the laws of electrodynamics, two light ...

Scientists observe CP violation in baryons, a key clue in understanding why matter dominates the universe over antimatter.