Printer Friendly

Seeking the top quark.

Of the six types of quarks that physicists postulate as the constituents of matter, only the top quark remains unobserved. Particle physicists working with two detectors - called CDF and DO -- at Fermilab's Tevatron collider in Batavia, Ill., have observed three collisions of a proton and an antiproton that may have produced a top quark. However, these events also fit alternative scenarios that do not include creation of a top quark. Until they obtain additional evidence, the researchers refuse to draw any conclusion about the top quark's discovery

"This is not going to be a 'eureka' moment," says John Peoples, Fermilab director. "It's going to take time."

Analyzing accumulated data from billions of collisions that produced no top quark, physicists using the CDF detector now report 108 billion electron-volts (108 GeV) as the new lower limit on the top quark's mass. This result raises the limit from last year's reported value of 91 GeV (SN: 3/21/92, p.189).
COPYRIGHT 1993 Science Service, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1993, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:two detectors observe three collisions that may have produced top quark
Author:Peterson, Ivars
Publication:Science News
Article Type:Brief Article
Date:Apr 24, 1993
Words:159
Previous Article:Tidying up the kilogram.
Next Article:Scouting for oil spills under ice.
Topics:


Related Articles
Quark-gluon plasma.
On the trail of elemental matter; experiments now being analyzed seek a quark-gluon plasma, matter stripped to its most elementary constituents.
Smashing debut for a subatomic fireball.
Beyond the Z: the latest generation of high-powered particle accelerators has produced no real surprises. What's next?
Putting limits on the top quark.
In search of the elusive top quark.
At last, evidence of the top quark.
Beyond the top: now that physicists have found the top quark, what's next?
Microcosmic bang: mashing atomic nuclei to create a quark soup.
Crashing debut of an exotic heavy particle?

Terms of use | Copyright © 2016 Farlex, Inc. | Feedback | For webmasters