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baryon
baryon
baryon Any member of a class of subatomic particles that includes protons and neutrons, as well as numerous others such as the Σ
+ (sigma-plus) and Ϊ
- (omega-minus) particles. Together with the
mesons, baryons form one of the two major classes of subatomic particles, the
hadrons. Baryons are composite particles, made up from three
quarks, and have a
spin of ½. All isolated baryons other than the proton are unstable and decay down to a proton plus other particles. See also
Non-baryonic Matter.
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FERMILAB PHYSICISTS DISCOVER 'TRIPLE-SCOOP' BARYON
News Wire article from: US Fed News Service, Including US State News; 6/13/2007; 700+ words
; ...926;b (pronounced "zigh sub b") baryon, with a mass of 5.7740.019 GeV...discovered electrically charged Ξb baryon, also known as the "cascade b," is...bottom quark. It is the first observed baryon formed of quarks from all three families...
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FERMILAB PHYSICISTS DISCOVER 'TRIPLE-SCOOP' BARYON; THREE-QUARK PARTICLE CONTAINS ONE QUARK FROM EACH FAMILY
News Wire article from: US Fed News Service, Including US State News; 6/13/2007; 700+ words
; ...926;_b (pronounced "zigh sub b") baryon. The UTA scientists are Professors Andy...discovered electrically charged Ξ_b baryon, also known as the "cascade b," is...bottom quark. It is the first observed baryon formed of quarks from all three families...
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Convergence issues in baryon chiral perturbation theory for the reaction [pi] + N [right arrow] 2[pi] + N (1).(Report)
Magazine article from: Canadian Journal of Physics; 6/1/2007; ; 700+ words
; ...2[pi] + N within the framework of heavy-baryon chiral perturbation theory of chiral order three...important results. While being successful, the baryon sector of the theory, known as Baryon Chiral Perturbation Theory ([B.sub.[chi...
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MICHIGAN PHYSICISTS PLAY KEY ROLE IN DISCOVERY OF STRANGELY BEAUTIFUL BARYON XI-B
News Wire article from: US Fed News Service, Including US State News; 6/14/2007; 700+ words
; ...particle called the Cascade b (Xi-b) baryon while working on the D0 (D-zero) experiment...point. The observation of the Xi-b baryon by the D0 experiment represents the first...all three known generations. The Xi-b baryon is made of a down, a strange, and a...
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Was a fifth force felt? (hypercharge or baryon number theory)
Magazine article from: Science News; 1/18/1986; ; 676 words
; ...acting. Fischbach and his co-workers relate this suggested force to a quality of matter called phpercharge or baryon number. The baryon number is related to the number of neutrons and protons, and therefore to the chemical composition of a material...
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FERMILAB'S COLLIDER DETECTOR AT FERMILAB OBSERVES OMEGA-SUB-B BARYON
News Wire article from: US Fed News Service, Including US State News; 7/3/2009; 700+ words
; ...solve the puzzle of these conflicting results. The Omega-sub-b discovery follows the observation of the Cascade-b-minus baryon, first observed at the Tevatron in 2007, and two types of Sigma-sub-b baryons, discovered at the Tevatron in 2006. The...
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Fermilab's CDF observes Omega-sub-b baryon.
Newspaper article from: NewsRx Health & Science; 8/2/2009; 700+ words
; At a recent physics seminar at the Department of Energy's Fermi National Accelerator Laboratory, Fermilab physicist Pat Lukens of the CDF experiment announced the observation of a new particle, the Omega-sub-b. The particle contains three quarks, two strange quarks and a bottom quark (s-s-b). It is
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Drexler's 'Missing-Baryons Dark Matter' May Be a Solution to a NASA Major Puzzle: 'Missing Baryons'.
News Wire article from: Ascribe Higher Education News Service; 1/17/2008; 700+ words
; ...can account for only about half of the baryon mass predicted by the standard cosmological...approach is hopeful because Relativistic-Baryon Dark Matter requires that a small mass...Dark Matter, now called Relativistic-Baryon Dark Matter, six years ago. This later...
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New theoretical physics data have been reported by R. Tamagaki and co-authors.(Report)
Newspaper article from: Physics Week; 9/9/2008; 641 words
; ...this study is to show a way to unifiedly understand the origin of repulsive core of baryon-baryon interaction and the origin of universal repulsion of three-baryon interaction whose importance has recently become noticeable. ''Universal...
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Reports summarize physics study results from Hiroshima University.
Newspaper article from: Physics Week; 11/10/2009; 700+ words
; ...Review D, "We investigate the quark mass dependence of baryon masses in 2 + 1 flavor lattice QCD using SU(3) heavy baryon chiral perturbation theory up to one-loop order. The baryon mass data used for the analyses are obtained for the degenerate...
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baryon
Book article from: The Columbia Encyclopedia, Sixth Edition
baryon [Gr.,=heavy], class of elementary particles that...obeying the Pauli exclusion principle . All members of the baryon family of particles adhere to the law of conservation of baryon family number (see conservation laws , in physics...
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baryon star
Book article from: A Dictionary of Astronomy
baryon star A star composed principally of baryons . In practice the term is a synonym for a neutron star , since the electrical repulsion of protons would disrupt a pure proton star.
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conservation laws
Book article from: The Columbia Encyclopedia, Sixth Edition
...annihilation of particles belonging to the baryon and lepton classes of particles have been...possibility that the proton, which is a type of baryon, may in fact be unstable and decay into...decay would violate the conservation of baryon number. To date, however, no such decay...
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Grand Unified Theory
Encyclopedia entry from: Encyclopedia of Science and Religion
...characteristics of the standard model, and of the universe itself. For example, there is no explanation for the baryon-anti-baryon asymmetry, which means that there is more matter in the universe than there is antimatter. There is also some...
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Gell-Mann, Murray
Book article from: World Encyclopedia
...particle ( omega-minus ). In 1964, he coined the term ‘ quark ’ to describe the basic constituent of the baryon and meson . Gell-Mann received the 1969 Nobel Prize in physics for his work on elementary particles .
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