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World's most precise measurement of the W boson mass

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The new CDF and Dzero combined result for the W boson mass (vertical section of green oval), combined with the world's best value for the top quark mass (horizontal section of green oval), restricts the Higgs mass requiring it to be less than 152 GeV/c2 with 95 percent probability. Direct searches have narrowed the allowed Higgs mass range to 115-127 GeV/c2. The grey bar shows the remaining area the Higgs could reside in.



The W boson mass measured by experiments across the world. The lines show the mass range while the dot shows the central value.



The orange oval shows the previous CDF and DZero combined result for the W boson mass (vertical section of the oval), combined with the world's best value for the top quark mass (horizontal section of the oval). The green oval shows the new result. The grey bar shows the remaining areas not ruled out for where the Higgs boson could reside.



The 4-mile in circumference Tevatron accelerator at Fermilab uses superconducting magnets chilled to minus 450 degrees Fahrenheit, as cold as outer space, to move particles at nearly the speed of light.



The Tevatron typically produces about 10 million proton-antiproton collisions per second. Each collision produces hundreds of particles. About 200 collisions per second are recorded at each detector for further analysis.



The three-story, 6,000-ton CDF detector takes snapshots of the particles that emerge when protons and antiprotons collide.



Control room for CDF where particle sprays from collisions are analyzed.



Scientists measure the energy, momentum and electric charges of subatomic particles using a three-story assembly of sub detectors wrapped around DZero's collision area like the layers of an onion.



Control room for CDF where particle sprays from collisions are analyzed.



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last modified 01/09/2012 |