By John Rennie
Read or Download [Magazine] Scientific American. Vol. 277. No 3 PDF
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Extra info for [Magazine] Scientific American. Vol. 277. No 3
Sample text
One used the signals from the silicon vertex chamber, which was functioning very well, to identify Copyright 1997 Scientific American, Inc. JENNIFER C. CHRISTIANSEN proton and an antiproton traveling in opposite directions along the beam line (pointed out of the page) collide at the center of the Collider Detector at Fermilab (CDF) (a). The impact produces four distinct jets (b) and a few other particles. Two jets, identified by a silicon vertex detector, are from the decay of a bottom and an antibottom quark, whereas two are from the decay of a W into a quark and an antiquark.
Such collisions are rare, and the higher the required energy—that is, the higher the top mass—the rarer they are. By 1988 the top had not yet been observed at CERN; the experimenters concluded its mass must be greater than 41 55 a b W JET W JET POSITRON BOTTOM/ ANTIBOTTOM JET 3 METERS tion. So we acquired in-house rivals: beginning in 1992 the D ø collaboration began to take data. In addition to spurring on our efforts, which it certainly did, having two complementary experiments studying the same physics was healthy in another way.
In Missouri in 1992 a church counselor helped Beth Rutherford to remember during therapy that her father, a clergyman, had regularly raped her between the ages of seven and 14 and that her mother sometimes helped him by holding her down.