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Topic: Exotic baryons

	Exotic baryon - Wikipedia, the free encyclopedia
		Ordinary baryons are bound states of 3 quarks.
		Exotic baryons are bound states of 3 quarks and additional particles.
		The pentaquark, which consists of four quarks and an anti-quark, is the only exotic baryon that has (allegedly) been detected.
	en.wikipedia.org /wiki/Exotic_baryon (241 words)

	Exotic baryon - Open Encyclopedia (Site not responding. Last check: 2007-10-22)
		In particle physics, an exotic baryon is a baryon (a strongly interacting fermion) composed of more than three quarks.
		Currently, only one type of exotic baryon, the pentaquark, is known.
		The possible existence of exotic baryons has been contemplated by physicists since the early 1970s, as it is an immediate consequence of quantum chromodynamics (the quantum field theory which describes hadrons), but the experimental discovery of the first exotic baryon did not occur until 2003.
	open-encyclopedia.com /Exotic_baryon (138 words)

	Exotic meson - Wikipedia, the free encyclopedia
		Exotic mesons, which have quantum numbers not possible for mesons in the quark model
		All of these can be classed as mesons, because they are hadrons and carry zero baryon number.
		Lattice QCD predictions for glueballs are now fairly stable, at least when virtual quarks are neglected.
	en.wikipedia.org /wiki/Exotic_meson (550 words)

	Multiquarks: Phenomenology
		Roles of instanton induced interactions (III) in the masses of pentaquark baryons, Theta^+ (J=1/2 and 3/2) and Xi^{--}, and a dibaryon, H, are discussed using the MIT bag model in the negative parity case.
		We analyze the magnetic moment of the exotic pentaquarks of the flavor antidecuplet in the constituent quark model for the case in which the ground state is in an orbital L(p)=0(+) or a L(p)=1(-) state.
		We calculate the suppression in the rate at which two baryons in a nucleus (viz., nucleons or $\Lambda$'s) convert to an H dibaryon, using an Isgur-Karl wavefunction for quarks in the baryons and H, and a Bethe-Goldstone wavefunction for the baryons in the nucleus.
	bloodaxe.phyast.pitt.edu /exotica/bib/MultiPh.html (9419 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		A comparison of the S = +1 theta baryons is made to the spectrum of the narrow width dibaryons.
		From this comparison, the rotational spectra of the exotic theta baryons are proposed.
		We analyze the importance of the 70 MeV quantum proposed by Mac Gregor and its relationship in the location of exotic baryons belonging to the antidecuplet.
	www.thphys.uni-heidelberg.de /cgi-bin/abstracts/hep-ph:0311031 (149 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)

	CERN Courier - The challenge of the pentaqu - IOP Publishing - article
		Volker Burkert reports on Pentaquark 2003, the first topical workshop on exotic baryons, which was held at Jefferson Lab in November.
		Although the exotic nature of the signal is not uniquely identified in this reaction, the absence of known Σ states that could mimic a pentaquark in this mass range is used to identify the state indirectly as the Θ
		In the chiral soliton model, it is a collective excitation of the mean chiral field that binds the baryons, and not a sum of the constituent quarks.
	cerncourier.com /main/article/44/3/18 (1471 words)

	Theta_discussion (Site not responding. Last check: 2007-10-22)
		Exotic baryon multiplets at large number of colours (D. Diakonov and V. Petrov)
		Exotic baryons and the large-Nc expansion (P. Pobylitsa)
		The width of the Theta exotic baryon in the Chiral Soliton Model (R. Jaffe)
	www.nordita.dk /~diakonov/Theta_discussion.html (117 words)

	The Interaction Point, May 6, 2005
		Exotic baryons refer to pentaquarks, whose quantum numbers cannot be reduced down to those of regular baryons.
		A meson (shown top) is composed of a quark and an antiquark, a regular baryon (center) consists of three quarks, and a pentaquark (bottom) is proposed to have four quarks and an antiquark.
		has both—very large samples (high statistics) of expected mesons and baryons and excellent mass resolution—with the ability to resolve signals from particles with small mass width.
	www2.slac.stanford.edu /tip/2005/may6/pentaquarks.htm (848 words)

	RPI Physics, Applied Physics, & Astronomy: Particle Physics
		Studies of unusual states of matter, exotic particles, provide unique insights into the fundamental properties of hadrons.
		Exotic mesons suggest that gluons, as well as quarks, manifest themselves in the structure of elementary particles.
		At Jefferson Laboratory we are focusing on the structure of baryons, and the search for exotic five-quark baryons called pentaquarks, and baryons.
	www.rpi.edu /dept/phys/research/particle.html (253 words)

	Extraction of the pion-nucleon sigma-term from the spectrum of exotic baryons (Site not responding. Last check: 2007-10-22)
		Extraction of the pion-nucleon sigma-term from the spectrum of exotic baryons
		The pion-nucleon sigma-term is extracted on the basis of the soliton picture of the nucleon from the mass spectrum of usual and the recently observed exotic baryons, assuming that they have positive parity.
		The study can also be considered as a phenomenological consistency check of the soliton picture of baryons.
	publish.edpsciences.org /abstract/EPJA/V22/P89 (132 words)

	Science News: Twice-charmed particles spotted? - Physics - Brief Article
		Although protons and neutrons are made of only so-called down and up quarks, researchers at high-energy particle colliders have for years been detecting exotic baryons containing beefier quarks called strange and charm quarks (SN: 8/25/01, p.
		The scientists have often created baryons containing two and even three strange quarks, but no one had ever detected a baryon containing more than one charm quark, at least no one thought so.
		Fermilab's Harry W.K. Cheung notes that a high-energy photon experiment called FOCUS didn't yield doubly charmed baryons among an abundance of singly charmed ones, a result that throws some doubt on the reanalysis of the SELEX data.
	www.24hourscholar.com /p/articles/mi_m1200/is_1_162/ai_89581044 (448 words)

	Observation of Exotic Baryon
		Until recently, no firm evidence of pentaquarks existed even though physicists have searched for these objects (also known as "exotic baryons") for over 30 years.
		This means we have a new classification of particle: the pentaquark (more precisely, an "exotic" baryon).
		At the least, we have found a new classification of quark matter, a particle (specifically, an exotic baryon) with "five" quarks.
	www.phy.ohiou.edu /~hicks/thplus/thplus1.html (738 words)

	L G Landsberg, EXOTIC BARYONS - issue 11, 1994 - Uspekhi Fizicheskikh Nauk (Site not responding. Last check: 2007-10-22)
		A review of the present status of the physics of exotic baryons is given.
		The models for these baryons are discussed as well as their production and decay processes, and methods of their identification.
		These states are candidates for cryptoexotic baryons with hidden strangeness.
	ufn.ioc.ac.ru /archive/abstracts/abst120.html (93 words)

	[No title]
		Observation of an Exotic S =+1 Baryon in Exclusive Photoproduction From The Deutron
		Evidence for an Exotic Baryon State, Theta+(1540), in Photoproduction Reactions from Protons and Deuterons with CLAS
		Observation of a baryon resonance with positive strangeness in K+ collisions with Xe nuclei
	www.jlab.org /~parkkj/cascades/penta_dvcs.html (259 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		Availability information may be found in the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or via the "Full-text Availability" link.
		Baryon 80 conference; 14 Jul 1980; Toronto, Canada
		The present status of exotic baryons including the S = 0 and S = +- 1 system, and five-quark exotic levels is discussed.
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=6595063 (124 words)

	POSTSCRIPT, PDF FILES FOR THE BARYONS --- 2004 UPDATE
		Cut-off date for this update was November 1, 2003.
		Complete list of Reviews found in the Baryon Listings.
		If you have problems, errata, or comments concerning the content of the Review of Particle Physics or concerning our WWW presentation, please send mail to pdg@lbl.gov.
	pdg.lbl.gov /2004/listings/bxxxcomb.html (111 words)

	UNM P&A Particle Physics Seminar (Site not responding. Last check: 2007-10-22)
		In a short introduction we will discuss heavy quark baryon spectroscopy and production with an emphasis on phenomenological approaches used by experimentalists.
		In 2003, Frank Wilczek and Robert Jaffe proposed a model for quark bound systems that predicts the existence of exotic five-quark states also known as pentaquarks.
		We will discuss the status of experimental searches for these exotic baryon states with an emphasis on recent results from CDF II Collaboration.
	www-hep.phys.unm.edu /~gold/phys500_f04/nov23.html (172 words)

	Pentaquark 04: Proceedings of International Workshop, Spring-8, Japan, 20-23 July 2004 (Site not responding. Last check: 2007-10-22)
		Study of Narrow Baryonic Pentaquark Candidates with the ZEUS Detector at HERA
		Parity of the Pentaquark Baryon from the QCD Sum Rule
		Pentaquark Baryon from the QCD Sum Rule with the Ideal Mixing
	www.booksmatter.com /b9812563385.htm (499 words)

	List of particles (Site not responding. Last check: 2007-10-22)
		Fermions, in which case they are called baryons.
		They do not normally appear in atomic nuclei.
		First hints at the existence of Exotic baryons have been found only recently.
	www.worldhistory.com /wiki/L/List-of-particles.htm (795 words)

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