theory shows its true colours
The aftermath of
a high-energy collision between a proton and an electron,
as seen by the H1 experiment at the DESY laboratory in Hamburg.
The experiment is shown in cross-section, perpendicular to
colliding beams of protons and electrons. The electron has
struck one of the quarks in a proton. An impressive shower
of particles - providing information about the struck quark
- is spontaneously produced from the energy strored in the
gluon force-field. The charged particles
in the shower bend in the experiment's strong magnetic field.