First 'neutral current' observation

First 'neutral current' observation

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This image is part of the feature 50 Years Of Cern Physics
This image is part of the feature Particle Art

Credit: CERN/SCIENCE PHOTO LIBRARY

Restrictions: Editorial use only. This image may not be used to state or imply endorsement by CERN of any product, activity or service

Caption: First observation of a 'neutral current' event. In this photo from the Gargamelle bubble chamber at CERN, a beam of neutrinos enters from bottom. Being neutral, the neutrinos leave no tracks, but at bottom left one sets in motion an electron, which heads up the picture, curling & fragmenting as it radiates photons. (The track curving across the top of the photo is not part of this event). This neutrino-electron interaction can only be a 'neutral current' event, due to the weak nuclear force & exchange of a force-carrying neutral Z particle. In 1972-3, Gargamelle physicists found this & 165 other examples of this interaction, which was predicted by the 'electroweak' theory.

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Keywords: bubble chamber photograph, cern, electroweak theory, gargamelle bubble chamber, high-energy physics, image, neutral current event, neutrinos, particle physics, photo, subatomic particles, the particle odyssey, weak nuclear force, z particle

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