Fermi National Laboratory


CDF sees collisions

April 4, 2001




April 3, 2001


Event display of an antiproton-proton collision at a center-of-mass energy of 2 TeV as seen by the CDF detector. The collision point is in the center of the display which represents the beam's eye view of the detector. Particles created in the collision enter a silicon detector system (innermost), then a large cylindrical drift chamber (showing hits and reconstructed tracks) followed by calorimeters and muon detection systems.

The trail of ionization left by charged particles in the drift chamber lead to "hits" on the drift chamber sense wires. A pattern recognition program connects these hits into reconstructed "tracks", each representing one of the created charged particles. The tracks are curved (seen here as segments of circles) because the drift chamber is located inside a strong magnetic field. The drift chamber diameter is about 10 feet (3m). The label "Et = 3.38 GeV" refers to the largest deposit of (transverse) energy in the calorimeter detector in this event.

last modified 4/4/2001   email Fermilab

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