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Precision measurement of W boson mass:
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The Standard Model describes the interactions of the fundamental particle of the world around us. Experimental observations agree with the predictions of the Standard Model with high precision. The W boson, the carrier of the electroweak force, is a key element in these predictions. Its mass is a fundamental parameter relevant for many predictions, including the energy emitted by our sun to the mass of the elusive Standard Model Higgs boson, which provides elementary particles with mass. Credit: Fermilab



Fermilab's DZero collaboration obtained the world’s most precise W mass value measured by a single experiment and announced its result at the annual conference on Electroweak Interactions and Unified Theories known as Rencontres de Moriond on March 8. Physicist Jan Stark, of the Laboratoire de Physique Subatomique in Grenoble, France, presented the result. Credit: DZero collaboration



The DZero collaboration comprises about 550 scientists from 18 countries who designed and built the 5,500-ton DZero detector and now collect and reconstruct collision data. They research a wide range of Standard Model topics and search for new subatomic phenomena. Credit: DZero collaboration



The Fermilab accelerator complex accelerates protons and antiprotons close to the speed of light. The Tevatron collider, four miles in circumference, produces millions of proton-antiproton collisions per second, maximizing the chance for discovery. Two experiments, CDF and DZero, record the collisions to look for signs of new particles and subatomic processes. Credit: Fermilab



The DZero detector records particles emerging from high-energy proton-antiproton collisions produced by the Tevatron. For the W mass precision measurement, the DZero collaboration analyzed about 500,000 decays of W bosons into electrons and neutrinos and determined the particle's mass with a precision of 0.05 percent. Credit: Fermilab



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Last modified: 04/28/2009 |