First observation of pair of W particles

First observation of pair of W particles

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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 pair of W particles. Electronic display of an event recorded in 1996 at the DELPHI detector at CERN, the particle physics laboratory near Geneva. An electron & positron, accelerated to high energy in CERN's LEP collider, have entered the detector from left & right to annihilate at centre. Their energy materialises as two W particles, a W-plus & a W-minus. Each W decays to a quark & an antiquark which in turn initiates a jet of particles, producing the 4 jets that spray out through the detector (shown in cut- away in pink, purple & blue). The W particles are gauge bosons which, together with the neutral Z particle, are carriers of the weak nuclear force.

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Keywords: 4-jet event, cern, computer screen, delphi particle detector, electronic display, electroweak theory, force-carrying particles, four jet event, four-jet event, gauge bosons, high-energy physics, lep collider, particle physics research, subatomic particles, the particle odyssey, w particles, w-minus, w-plus

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