First neutral Current Observation Photograph by Science Photo Library

First 'neutral Current' Observation

by Science Photo Library

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Title

First 'neutral Current' Observation

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Science Photo Library

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Photograph - Photograph

Description

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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February 17th, 2021

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