Smashing Pictures

This image shows the first Omega-minus particle to be discovered. An incoming K- meson collides with a proton in a liquid hydrogen bubble chamber producing the Omega-minus, a K+ meson, and a K0 meson. Neutral particles leave no tracks in the chamber and are denoted by dashed lines. The positions of the neutral particles are inferred from the visible decay products and by the use of the laws of conservation of energy and momentum.