Beneath its surface, a proton teems with activity. You've probably heard that particles such as protons have mass and charge. They also have a property called spin. Technologies such as magnetic ...

Comparing the number of direct photons emitted when proton spins point in opposite directions (top) with the number emitted when protons collide head-to-tail (bottom) revealed that gluon spins align ...

Nuclear physicists have long been working to reveal how the proton gets its spin. Now, a new method that combines experimental data with state-of-the-art calculations has revealed a more detailed ...