D0 experiment
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The DØ experiment consists of a worldwide collaboration of scientists conducting research on the fundamental nature of matter. The experiment is located at the world's highest-energy accelerator, the Tevatron Collider, at the Fermi National Accelerator Laboratory (Fermilab) in Batavia, Illinois, USA. The research is focused on precise studies of interactions of protons and antiprotons at the highest available energies. It involves an intense search for subatomic clues that reveal the character of the building blocks of the universe.
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[edit] Overview
The DØ experiment is located at one of the interaction regions, where proton and antiproton beams intersect, on the Tevatron synchrotron ring, labelled 'DØ'.
The experiment is a test of the Standard Model of particle physics. It is sensitive in a general way to the effects of high energy collisions and so is meant to be a highly model independent probe of the theory. This is accomplished by constructing and upgrading a large volume elementary particle detector.
The detector is designed to stop as many as possible of the subatomic particles created from energy released by colliding proton/antiproton beams. The intersection region where the matter-antimatter annihilation takes place is close to the geometric center of the detector. The beam collision area is surrounded by tracking chambers in a strong magnetic field parallel to the direction of the beam(s). Outside the tracking chamber are the pre-shower detectors and the calorimeter. The Muon Chambers form the last layer in the detector. The whole detector is encased in concrete blocks which act as radiation shields.
[edit] Physics Reach
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[edit] New Phenomena
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From a press release dated June 13, 2007:
Physicists of the DZero experiment at the Department of Energy's Fermi National Accelerator Laboratory have discovered a new heavy particle, the Ξb (pronounced "zigh sub b") baryon, with a mass of 5.774±0.019 GeV/c2, approximately six times the proton mass. The newly discovered electrically charged Ξb baryon, also known as the "cascade b," is made of a down, a strange and a bottom quark. It is the first observed baryon formed of quarks from all three families of matter. Its discovery and the measurement of its mass provide new understanding of how the strong nuclear force acts upon the quarks, the basic building blocks of matter.
[edit] Higgs
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[edit] Top Quark
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[edit] B Mesons
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[edit] The W and Z Bosons
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[edit] The strong force ( QCD )
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[edit] Detector
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[edit] Silicon Microstrip Tracker
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[edit] Central Fiber Tracker
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[edit] EM Pre-Shower Detectors
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[edit] Calorimeter
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[edit] Muon Detector
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[edit] Trigger and DAQ
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[edit] The Front Ends
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[edit] Level One Trigger
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[edit] Level Two Trigger
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[edit] Level Three Trigger
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[edit] Offline Data Analysis
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[edit] Reconstruction
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[edit] Display
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