Production and decay of omega particle

Production and decay of omega particle

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Credit: LAWRENCE BERKELEY LAB/SCIENCE PHOTO LIBRARY

Caption: Bubble chamber photograph of an event consistent with the production & decay of an omega resonance particle. (Resonances are very short-lived excited states of subatomic particles). An antiproton enters at bottom centre & annihilates with a proton in the bubble chamber's liquid, apparently producing 2 negative pions (which move to the left), 2 positive pions (which move right), & an invisible neutral pion. But analysis of the tracks showed that one pair of pions did not come from the proton-antiproton annihilation point; instead they are the decay products of the omega resonance created in the original annihilation, but which lives too briefly to be seen.

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Keywords: antiproton, bubble chamber, image, muon, omega resonance, particle physics, particles, photo, photograph, pi-mu-e, pion, positron, resonance, subatomic

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