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Topic: Baryon


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In the News (Mon 22 Apr 19)

  
  Baryon - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-11-07)
Baryons are strongly interacting fermions — that is, they experience the strong nuclear force and are described by Fermi-Dirac statistics, which apply to all particles obeying the Pauli exclusion principle.
Baryons, along with mesons, belong to the family of particles known as hadrons, meaning they are composed of quarks.
Baryonic matter is matter composed mostly of baryons (by mass), which includes atoms of any sort (and thus includes nearly all matter that we may encounter or experience in everyday life, including ourselves).
www.bexley.us /project/wikipedia/index.php/Baryons   (596 words)

  
 The Baryon Fraction Test
The main impact of varying the baryon fraction is on the relative amplitude of the peaks in the angular power spectrum of the microwave background (as expanded in spherical harmonics).
In the purely baryonic MOND cases, there is a longer drop from the first peak to the first trough, and a shorter rise to the second peak than in the CDM cases.
Baryonic models with zero neutrino mass have perceptibly broader peaks than the equivalent CDM model, but zero CDM models with finite neutrino mass have peaks which are similar in width to those in the CDM models.
www.astro.umd.edu /~ssm/papers/cmbpp/node2.html   (1229 words)

  
 Baryon   (Site not responding. Last check: 2007-11-07)
The baryons are a family of subatomic particles including the proton, the neutron (collectively called nucleons), and a number of unstable, heavier particles (called hyperons).
Baryons are strongly interacting fermions, that is, they experience the strong nuclear force and are described by Fermi-Dirac statistics, which apply to all particles obeying the Pauli exclusion principle.
Baryons have three quarks, whereas mesons have a quark and an antiquark and so are bosonic.
www.theezine.net /b/baryon.html   (166 words)

  
 MSN Encarta - Search Results - baryon
Baryon, subatomic particle that is composed of three smaller particles called quarks.
Two of the particles found in atoms are baryons: the proton and...
Theoretically a baryon can consist of any three quarks, but only certain combinations have been observed.
encarta.msn.com /baryon.html   (105 words)

  
 AllRefer.com - baryon (Physics) - Encyclopedia
From a technical point of view, baryons are strongly interacting fermions; i.e., they experience the strong nuclear force and are described by the Fermi-Dirac statistics, which apply to all particles 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); the baryon family number is +1 for ordinary baryons and -1 for antibaryons (see antiparticle).
In addition to the nucleons (protons and neutrons), other members of the baryon family include the lambda, sigma, delta, xi, and N particles, as well as a series of higher-mass recurrences of each of these particles.
reference.allrefer.com /encyclopedia/B/baryon.html   (285 words)

  
 [142.08] Baryon Oscillations in the Large Scale Structure   (Site not responding. Last check: 2007-11-07)
The oscillations in baryons are frozen in at the time of decoupling from photons and are expected to be present in the power spectrum of matter fluctuations today.
Compared to CMB peaks, due to small baryon to cold dark matter density fractions of order 10% to 15% in currently flavored cosmologies, the oscillations in the matter power spectrum have amplitudes which are significantly smaller with amplitudes less than 10%.
We discuss various observational possibilities of baryon oscillations in the matter power spectrum and suggest that surveys sensitive to galaxy groups at redshifts around one may be better than surveys at low redshifts involving galaxies.
www.aas.org /publications/baas/v33n4/aas199/174.htm   (317 words)

  
 Physics Today - Search and Discovery September 2003
It's been a long-standing puzzle that the quantum numbers of all the known mesons and baryons could be attributed to bound states of two or three quarks.
Before this year, every one of the hundreds of well-established baryons and mesons (collectively called hadrons) could be described either as a bound triplet of quarks (the baryons) or a bound quark-antiquark pair (the mesons).
It was soon recognized that the three-flavor skyrmion model predicted the existence of an "antidecuplet" of presumably undiscovered baryon species that all have the same spin (1/2) and intrinsic parity (+) as the nucleon (see figure 1).
www.physicstoday.org /vol-56/iss-9/p19.html   (2446 words)

  
 Baryon homepage   (Site not responding. Last check: 2007-11-07)
Baryons consist of three quarks and interact through the strong force, which holds atomic nuclei together.
The law of conservation of baryons states that for any interaction of elementary particles, the sum of baryon numbers remains unchanged.
Federation starships must periodically undergo "Baryon Sweeps" at facilities such as the Remmler Array to clear them of contamination.
www.baryon.demon.nl   (79 words)

  
 Search Results for baryon -¬†Encyclop√¶dia Britannica
Baryons are heavy subatomic particles that are made up of three quarks.
The proton and the neutron are the most common examples of the class of subatomic particles known as hadrons.
Stable subatomic particle (one of the baryons) with a unit of...
www.britannica.com /search?miid=1113818&query=baryon   (442 words)

  
 Observation of Exotic Baryon
Although research is on-going, evidence is mounting in favor of the existence of a new subatomic particle known as the pentaquark.
The pentaquark, made up of "five" quarks (specifically, 4 quarks and 1 anti-quark), that was found is the first example of a new classification of particle known as an exotic baryon.
The classic example of a baryon is the proton, with two "up" quarks and one "down" quarks.
www.phy.ohiou.edu /~hicks/thplus/thplus2.html   (708 words)

  
 FOCUS double charm baryon search
An extensive search for fully reconstructed doubly-charmed baryon candidates using FOCUS data was conducted in 2000.
Cuts were chosen by maximizing S/sqrt(B) where S is determined from Monte Carlo simulated events and B is taken from the data over the mass range 3.4 to 4.1 GeV.
Below are plots of all double charm baryon candidates which were searched for as well as just the two decay modes searched for by SELEX, with the SELEX signal areas shaded.
www-focus.fnal.gov /xicc/xicc_focus.html   (728 words)

  
 The Xi Baryon   (Site not responding. Last check: 2007-11-07)
The Xi or "cascade" baryon was seen in the same reaction which led to the discovery of the omega-minus baryon at Brookhaven in 1964.
At left is a sketch of the bubble chamber photograph in which the omega-minus baryon was discovered.
In this decay of the Xi particle, a lambda baryon and two gamma rays are shown as the products.
hyperphysics.phy-astr.gsu.edu /hbase/particles/xi.html   (231 words)

  
 Baryon Number Generation in the Early Universe (1980)
If particles carrying baryon number also carry electric charges (but the sum of the charges of all baryon species is non-zero), then to maintain the overall charge neutrality of the universe any baryon excess must be compensated by a suitable antilepton excess.
produced eventually decay approximately symmetrically to baryons and antibaryons, and hence baryon asymmetry is diminished.
then the calculations of baryon number generation given above must be modified considerably; in the standard SU(5) model this case does not occur, except in the presence of massive fermions forbidden by other considerations [20].
www.stephenwolfram.com /publications/articles/cosmology/80-baryon/5/text.html   (1524 words)

  
 Baryon Loading
So far we have been neglecting the baryons in the dynamics of the acoustic oscillations.
For typical values of the baryon density this number is of order unity at recombination and so we expect baryonic effects to begin appearing in the oscillations just as they are frozen in.
Baryons are conceptually easy to include in the evolution equations since their momentum density provides
background.uchicago.edu /~whu/araa/node10.html   (392 words)

  
 Baryon   (Site not responding. Last check: 2007-11-07)
Baryons are characterized by a baryon number of one (1).
An atom containing, for example, one proton and one neutron (each with a baryon number of one) has a baryon number of two.
In addition to their differences in composition, baryons and mesons can be distinguished from one another by spin: the three quarks that make up a baryon can only produce half-integer values, while meson spins always add up to integer values.
home.earthlink.net /~tdp/baryon.html   (126 words)

  
 Wired News: Hunting the Doubly Charmed Baryon
After double-checking their numbers with others in the international firmament of high-energy particle physicists, Russ and company will present their preliminary findings at a big conference in Vancouver in late June, and then at a bigger conference in Amsterdam in late July.
The decays of these desired particles are captured by silicon strip detectors, which feed data about the particles' direction and momentum to a file-sharing farm of PC computers that crunch the numbers.
Compared to the predictions of theory, the difference in mass between the double-charmed baryons with an up quark and those with a down quark is much bigger, and the rate of production is much higher.
www.wired.com /news/technology/0,1282,53035,00.html   (848 words)

  
 Home of the Underdogs - Entry: Baryon   (Site not responding. Last check: 2007-11-07)
One of the best top-down shooters ever made, but also one of the most unknown due to lack of distribution, Baryon takes you on a cruise through alien-infested territory as you collect power-ups and shoot everything in sight.
Quick manuevering in avoiding fire will be essential to successfully reaching the big bad boss that usually reside at the end of the level.
Baryon may not have the sharper graphics found in today's arcade games, but the action and the powerup bonuses makes it worthwhile and enjoyable.
www.the-underdogs.org /game.php?name=Baryon   (225 words)

  
 Citebase - Heavy Baryon Masses in Large N_c HQET   (Site not responding. Last check: 2007-11-07)
A systematic expansion in 1/N is constructed for baryons in QCD.
The possibility of interpreting baryons containing a single heavy quark as bound states of solitons (that arise in the nonlinear sigma model) and heavy mesons is explored.
We show there is considerable experimental evidence that the baryon masses satisfy the hierarchy predicted by this expansion.
citebase.eprints.org /cgi-bin/citations?archiveID=oai:arXiv.org:hep-ph/9611288   (789 words)

  
 Dark Matter from Baryon Asymmetry   (Site not responding. Last check: 2007-11-07)
The measured densities of dark and baryonic matter are surprisingly close to each other, even though the baryon asymmetry and the dark matter are usually explained by unrelated mechanisms.
We consider a scenario where the dark matter S is produced non-thermally from the decay of a messenger particle X, which carries the baryon number and compensates for the baryon asymmetry in the Universe, thereby establishing a connection between the baryonic and dark matter densities.
Therefore in hadron colliders the signal is similar to that of a stable or long-lived gluino in supersymmetric models.
hep.bu.edu /abstracts/low-dec-04.html   (131 words)

  
 Observation of Exotic Baryon   (Site not responding. Last check: 2007-11-07)
Ordinary hadrons include baryons and mesons, which are described by three-quark and quark-antiquark configurations, respectively.
The new data show strong evidence for a five-quark baryon state at a mass of 1.54 GeV, with a narrow width of 22 MeV (FWHM).
The discovery of this new exotic baryon state should have far-reaching consequences for our theory of hadronic interactions that attempt to explain the structure of matter and the possible states of matter.
plato.phy.ohiou.edu /~hicks/thplus/thplus3.html   (412 words)

  
 Baryon Number Violation and String Hadronization (ResearchIndex)   (Site not responding. Last check: 2007-11-07)
Abstract: In supersymmetric scenarios with broken R-parity, baryon number violating sparticle decays are possible.
We report on the development of a framework allowing detailed studies with special attention given to the hadronization phase.
In our model, implemented in the Pythia event generator, the baryon number violating vertex is associated with the appearance of a junction in the colour con nement eld.
citeseer.ist.psu.edu /620743.html   (246 words)

  
 Citebase - Protecting the Baryon Asymmetry in Theories with R-parity Violation   (Site not responding. Last check: 2007-11-07)
It requires the introduction of a baryon number carrying singlet which is in equilibrium in the early universe and shares any existing baryon asymmetry.
Majorana masses of the neutrino implies lepton number violation and is intimately related to the lepton asymmetry of the universe, which gets related to the baryon asymmetry of the universe in the presence of the sphalerons during the electroweak phase transition.
Non-perturbative electroweak effects, in thermal equilibrium in the early universe, have the potential to erase the baryon asymmetry of the universe, unless it is encoded in a B-L asymmetry, or in some "accidentally" conserved quantity.
citebase.eprints.org /cgi-bin/citations?archiveID=oai:arXiv.org:hep-ph/9609497   (1360 words)

  
 The Omega Baryon
The omega-minus, a baryon composed of three strange quarks, is a classic example of the need for the property called "color" in describing particles.
Since quarks are fermions with spin 1/2, they must obey the Pauli exclusion principle and cannot exist in identical states.
The discovery of the omega baryon was a great triumph for the quark model of baryons because it was searched for and found only after its existence, mass, and decay modes were predicted by the quark model.
hyperphysics.phy-astr.gsu.edu /HBASE/particles/omega.html   (326 words)

  
 Powell's Books - Lepton & Baryon Number Violation in Part by Klapdor-kleingrothau
The main topics include: B and L violation and grand unified theories; B and L violation in the earn Universe, in cosmology and astrophysics Lepton family number violation: B and L violation and collider physics.
The proceedings of the April 1998 symposium presents reviews of theoretical ideas and experimental results regarding baryon number (B) and lepton number (L) violation in particle physics, nuclear physics, rare decays and cosmology.
The first of the 39 chapters overview B and L violation in grand unified theories, with lepton number and lepton flavor violation in left-right symmetric models and the flavor problem in SUSY.
www.powells.com /cgi-bin/biblio?inkey=4-0750306165-0   (289 words)

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