AOH :: FERMI1.TXT
Experimental Evidence for the Top Quark!
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| File Name : FERMI1.ASC | Online Date : 03/10/95 |
| Contributed by : Steve Gantt | Dir Category : UNCLASS |
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The following news release was downloaded from Fermi National Laboratory's
Internet connection (see end of article for address). In today's paper an
article was released that stated Fermi National Labratory was actually found
the Top Quark and will be releasing information soon. I'll upload more as it
becomes available. Steve Gantt
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News Release - April 26, 1994
(Fermilab Home)
NEW EVIDENCE IN THE SEARCH FOR THE TOP QUARK
Batavia, IL - Physicists at the U.S. Department of Energy's Fermi National
Accelerator Laboratory today (April 26) announced new results in the search
for the top quark. The Collider Detector at Fermilab collaboration presented
the first direct experimental evidence for the top quark, a subatomic particle
that is the last undiscovered quark of the six predicted by current scientific
theory. Scientists worldwide have sought experimental evidence for the top
quark since the discovery of the bottom quark at Fermilab in 1977.
A research paper, submitted Friday, April 22, to The Physical Review by the
440-member CDF collaboration, presents evidence for the production of top
quarks in world-record high-energy collisions between protons and antiprotons,
their antimatter counterparts, at Fermilab's Tevatron particle accelerator.
The CDF collaboration presented its results at a scientific colloquium held
April 26 at Fermilab.
CDF researchers stopped short of claiming discovery of the top quark, however.
"We have not yet observed enough examples of top quark production to establish
the particle's existence beyond question," said CDF cospokesperson Melvyn
Shochet. "Nevertheless, this new evidence points strongly to the existence of
the sixth and final quark that we have been seeking for so long."
He added that the collaboration expects data from the collider run now
underway at Fermilab to yield enough additional top quark events in the next
few months to confirm the particle's existence and to improve the precision of
measurements of its mass. The Tevatron is the world's highest energy
accelerator, the only one capable of producing the top quark.
"I share the excitement of the scientists at Fermilab and around the world who
have contributed to this success," said U.S. Secretary of Energy Hazel R.
O'Leary. "These results give new impetus to Fermilab's compelling work
exploring the frontiers of particle physics."
Scientists are eager to find and study the top quark, because its discovery
would strongly support the Standard Model, the prevailing theory of the
particles and forces that determine the fundamental nature of matter and
energy. Despite intensive searches at accelerator laboratories in Europe,
Japan, and the United States, the top quark has eluded discovery because of
its apparent large mass in comparison to other subatomic particles.
The more massive a subatomic particle, the more energy is required to produce
it in collisions, and the more difficult it is to find. The Laboratory's
DZero collaboration also presented analyses of their top search experiments,
providing information beyond recently published results. DZero's preliminary
analyses currently show no significant signal for the top quark. "More data
are likely needed to reach a definitive conclusion," said DZero cospokesperson
Hugh Montgomery.
CDF's particle detector, the heart of the collaboration's experiment, was
constructed with funds provided by the U.S. Department of Energy, the Japanese
Ministry of Education, Science and Culture (MONBUSHO), and the Italian
Institute for Nuclear Physics (INFN), and the National Science Foundation.
Besides U.S. scientists, CDF includes physicists from Italy and Japan, as well
as Canadian and Taiwanese experimenters. The DZero collaboration includes many
U.S. institutions and groups from Brazil, Colombia, France, India, Korea,
Mexico, and Russia. Funds for DZero's detector came from DOE, NSF, Russia,
and France.
"It is gratifying that after more than a decade of intensive searching," said
Fermilab Director John Peoples, "we are beginning to observe direct evidence
of the top quark. As our research tools improve, the experimenters will find
still more evidence for its existence. The top quark, a subatomic particle
that appears to be as as heavy as an entire gold atom, may well unlock some of
nature's best-kept secrets."
Fermilab, 30 miles west of Chicago, was established in 1967 as a high-energy
physics research laboratory. It is operated by Universities Research
Association, Inc., under contract with the U.S. Department of Energy.
Background Material on New Evidence in the Search for the Top Quark.
______________________________________________________
Contact: Public Information (708) 840-3351 or email:
topquark@fnal.gov
webmaster@fnal.gov
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