Article: Sticky questions inside the proton

Hydrogen is the most abundant substance in the universe. It is also the simplest of all the atoms, its nucleus consisting of a single proton around which orbits a solitary electron. The proton is therefore important, if only because it is the major constituent of the most abundant element.

But protons are the constituents of all atomic nuclei. The structure and internal dynamics of the proton, although it may seem rather recherche a topic, is thus one of the most fundamental issues in the study of the physical world.

And things are sticky inside the proton. Experiments at the Hera accelerator in Hamburg are throwing new light on the nature of subatomic particles. When the results were ...

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