One of the most famous bubble chamber pictures of all - this shows the discovery of omega minus in the Brookhaven National Laboratory 80 inch hydrogen bubble chamber in 1964.
The 5.0 GeV/c K- beam interacts with a proton:
K minus + p --> omega minus + K+ + K0
The omega minus then decays to Xi zero + pi minus, with subsequent decay of the xi zero to a lambda and a pi zero.
Educational exercises on the original data.