Bubble chamber picture of the decay of an antilambda to an antiproton and a pi+

The dark lines in this picture are produced by charged particles as they force their way through liquid deuterium.

The first highlighted track shows the trajectory of the antilambda from the decay of an antiomega- (see kink on this blowup of the interaction region; click here.)

The vee shows the decay products of the antilambda , an antiproton and a .

In the top left corner of the picture, the antiproton annihilates with a proton constituent of a deuteron, producing a 6-pronged annihilation 'star’. (If it had struck a neutron, the number of prongs would, by charge conservation, have to be odd.)

This event was important in particle physics because it was the first observation of the anti-particle of the omega minus.

For details of this event, click here.