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Topic: Exotic meson

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	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.
		Even when there is agreement that one of several states is one of these non-quark model mesons, the degree of mixing, and the precise assignment is fraught with uncertainties.
	en.wikipedia.org /wiki/Exotic_meson (568 words)

	Meson - Wikipedia, the free encyclopedia
		In particle physics, a meson is a strongly interacting boson, that is, it is a hadron with integral spin.
		Pseudoscalar mesons (spin 0) have the lowest rest energy, where the quark and antiquark have opposite spin, and then the vector mesons (spin 1), where the quark and antiquark have parallel spin.
		Mesons were originally predicted as carriers of the force that bind protons and neutrons together.
	en.wikipedia.org /wiki/Meson (1088 words)

	Exotic baryon - Wikipedia, the free encyclopedia
		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.
		Stable exotic baryons are also candidates for strongly interacting dark matter.
	en.wikipedia.org /wiki/Exotic_baryon (247 words)

	Notre Dame physicists discover evidence of a new subnuclear particle - University of Notre Dame : News & Information
		A meson is a very unstable, medium-mass elementary particle with a short life span that is similar to but smaller than a proton or neutron.
		The building blocks of one type of exotic meson are a quark, an antiquark and gluon, yet another elementary particle that "glues" together the quark and antiquark.
		However, the discovery of the exotic meson is significant because it will allow physicists to expand their understanding of nature at its most fundamental level, Cason said.
	newsinfo.nd.edu /content.cfm?topicId=833 (637 words)

	Highbeam Encyclopedia - Search Results for Meson (Site not responding. Last check: 2007-11-02)
		meson MESON [meson] [Grmiddle (i.e., middleweight class of elementary particles whose masses are generally between those of the lepton class of lighter particles and those of the baryon class of heavier particles.
		pion PION [pion] or pi meson, lightest of the meson family of elementary particles.
		Meson G Goes Hollywood - Stars as Location for New Fox TV pilot Kitchen Confidential; Executive Chef Josef Centeno Takes the Reigns Behind the Scenes in Meson G's Kitchen.
	www.encyclopedia.com /SearchResults.aspx?Q=Meson (640 words)

	NewStandard: 9/1/97
		The new particle is called an exotic meson, and was found after five years of research by 51 scientists from around the world.
		In this experiment, the properties of the oscillating gluon string were expected to reveal themselves in the properties of the meson.
		This experiment found the first evidence for the existence of the new class of mesons in which the gluon string is evident.
	www.s-t.com /daily/09-97/09-01-97/b01lo046.htm (551 words)

	Hybrid: Phenomenology
		Photoproduction of the axial hybrid meson is predicted to be large courtesy of $\pi$ exchange, and its strange counterpart is predicted in $B \to \psi K_H(1^+)$ with $b.r.
		We investigate the possibility that the light-mass exotic mesons with J^PC=1^-+ observed at BNL and CERN may be resonances in the eta-pi and eta'-pi systems associated with the anomalous glue which generates the eta' mass in QCD.
		THE PHOTOPRODUCTION OF HYBRID MESONS FROM CEBAF TO HERA.
	fafnir.phyast.pitt.edu /exotica/bib/HybridPh.html (4392 words)

	[No title] (Site not responding. Last check: 2007-11-02)
		Such exotic atoms have to be created artificially and are unstable.
		The antiparticle is eventually stopped in the gas chamber, forming an exotic atom.
		Once the antiparticle is captured into an bound state of the atom due to its negative charge, it starts decaying toward the nucleus.
	www.cita.utoronto.ca /~kaya/exotic.html (211 words)

	Exotic debut - 13 September 1997 - New Scientist
		A NEW subatomic particle called an exotic meson may have popped into existence at the Brookhaven National Laboratory in Upton, New York.
		It is either a combination of a quark, an antiquark and a gluon, or a cluster of two quarks and two antiquarks.
		Exotic mesons turned up among the debris of the collisions, they say in last week's
	www.newscientist.com /article.ns?id=mg15520994.800 (199 words)

	Exotic meson challenges rules (July 2005) - Physics World - PhysicsWeb
		The simple hadronic structures that we see are easy to define: mesons such as pions and kaons consist of a quark and an antiquark pair, while baryons such as protons and neutrons are made up of three quarks or three antiquarks.
		Indeed, a meson can be more generally defined as a hadron that has an integer value of intrinsic angular momentum in quantum units, while baryons have half-integer multiples of spin.
		The challenge now is to follow up the leads offered by the new mesons to build a consistent theoretical picture of what causes these more complicated states to form, and to find new experimental methods to clarify the systematics of these processes.
	physicsweb.org /articles/world/18/7/4 (1492 words)

	Evidence of New Particle Seen at BNL Accelerator
		The physicists then weeded out possible exotic mesons from the billions of particles produced in the target, and analyzed their results using sophisticated statistical techniques.
		In normal mesons, the gluon "string" is stretched tight, in what is called its ground state, and is not vibrating.
		Some of those theoretical mesons have been predicted to have properties not allowed in normal mesons, making them "exotic." A meson could also have these exotic properties if it consisted of a pair of quarks and a pair of anti-quarks, instead of just one quark and one anti-quark.
	www.bnl.gov /bnlweb/pubaf/pr/1997/bnlpr090197.html (823 words)

	Multiquarks: Phenomenology
		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.
		Remarkably, in the case of 2-body decays of the B mesons, the leading contribution to the coalescence probability depends only on hadron masses and on the width and branching fractions of the B meson.
		The $0^{++}$ light mesons and the new $D$ states measured at different factories cannot be described as $q\bar q$ pairs and a tetraquark structure is suggested.
	bloodaxe.phyast.pitt.edu /exotica/bib/MultiPh.html (9419 words)

	Abstracts for E852 (Site not responding. Last check: 2007-11-02)
		Study of mesons decaying to (Omega Pi+- Pi-+) in the reaction pi- p -> pi+ pi+ pi- pi- pi0 n at 18 GeV/c
		Study of the reaction pi- p -> omega pi- pi0 p at 18 GeV/c Study of mesons decaying to (Omega Pi+- Pi-+) in the reaction pi- p -> pi+ pi+ pi- pi- pi0 n at 18 GeV/c
		Exotic Meson Signal in the eta pi- System in pi- p Interactions at 18 GeV/c
	www.phy.bnl.gov /~e852/abstracts.html (721 words)

	Citebase - Role of Photoproduction in Exotic Meson Searches (Site not responding. Last check: 2007-11-02)
		exotic meson, hadroproduction, using pion beams and photoproduction.
		Furthermore we show that the low-t photoproduction of exotic meson is enhanced as compared to hadronic production.
		This findings support the simple quark picture in which exotic meson production is predicted to be enhanced when the beam is a virtual QQ pair with a spin-1 (photon) rather then with a spin-0 (pion).
	citebase.eprints.org /cgi-bin/citations?id=oai:arXiv.org:hep-ph/0105329 (165 words)

	ScienceDaily: Evidence Discovered Of New Subnuclear Particle
		Evidence of a new subnuclear particle -- an exotic meson -- has been discovered by a team of physicists from the University of Notre Dame and six other institutions.
		Surprise: Fermilab's SELEX Experiment Finds Puzzling New Particle (June 18, 2004) -- The new meson, a combination of a strange quark and a charm antiquark, is the heaviest ever observed in this family, and it behaves in surprising ways -- it apparently breaks the rules on decaying...
		Physicists Reconsider The Nature Of Turbulence (March 26, 1999) -- Modifications may be needed to current theories describing the character of turbulence -- with applications in understanding atmospheric airflows and weather, oceanic currents and even the fluididty...
	www.sciencedaily.com /releases/1997/09/970902045006.htm (1923 words)

	Physics of Experiment 852 (Site not responding. Last check: 2007-11-02)
		Exotic mesons (also refered to as exotics) are bound states which are not composed of a quark/anti-quark pair (as a meson is) or of three quarks (as a baryon is).
		There are 3 main types of exotics mesons.
		This is a variation on the meson structure of a quark and an anti-quark.
	www.phy.bnl.gov /~e852/intro/physics.html (202 words)

	Physics Department Faculty: William D. Shephard (Site not responding. Last check: 2007-11-02)
		At BNL, partial wave analyses of specific final states are used to search for exotic mesons produced in pion-proton interactions observed in the Multi-Particle Spectrometer (MPS).
		Exotic mesons, whose internal structure differs from the normal quark-antiquark valence structure of mesons in the simple quark model, are expected to exist within the framework of quantum chromodynamics (QCD).
		Such mesons have been observed for the first time in our experiments and we are measuring their properties in order to obtain a deeper understanding of QCD, the theory of strong interactions.
	www.physics.nd.edu /Faculty/shephard.html (323 words)

	meson
		Heavier mesons include the kaon (K meson), eta meson, and a number of higher-mass recurrences of the lighter mesons.
		The heaviest mesons are heavier than some baryons, such as the proton and neutron, but their classification as mesons is based on their behavior rather than on their mass.
		It is now known that each type of meson consists of a quark bound to an antiquark.
	www.infoplease.com /ce6/sci/A0832854.html (376 words)

	Exotic Meson Spectroscopy with CLAS - Adams, Collab (ResearchIndex) (Site not responding. Last check: 2007-11-02)
		Exotic Meson Spectroscopy with CLAS - Adams, Collab (ResearchIndex)
		CLAS detector to study peripheral photoproduction of exotic meson is examined.
		The major emphasis of the current research is in the area of gluonic matter and non-conventional states.
	citeseer.ist.psu.edu /176682.html (373 words)

	Physics News Update Number 334 - EXOTIC MESON AT BROOKHAVEN? (Site not responding. Last check: 2007-11-02)
		Testing the notable proposition that quarks always bind in groups of two (quark- antiquark objects called mesons) or three (baryons), physicists at BNL send 18-GeV pi mesons into a hydrogen target and then harvest events in which the emergent debris includes eta mesons and pi mesons.
		Most of the time this is the humdrum a2 meson, with a mass of 1320 MeV.
		Two things in combination hint that something unusual is happening: first, the relative angle between the outgoing eta's and pi's suggests a rivalry or "interference" between the a2 meson and the mysterious particle, strengthening the argument that the particle exists and is not just a spurious blip in the data.
	www.aip.org /enews/physnews/1997/split/pnu334-1.htm (196 words)

	95-0267 (Site not responding. Last check: 2007-11-02)
		In the framework of this project it is planned to continue a study of inclusive multiparticle states (both charged particles with identification and neutrals), systematic analysis and interpretation of existing data from the VES (VErtex Spectrometer) setup, and the Crystal Barrel.
		The meson resonances and the exotic states with masses up to 2.5-3 GeV will be investigated.
		mesons with an exhaustive study of GAMS data, fitted simultaneously with Crystal Barrel data.
	www.intas.be /catalog/951-0267.htm (655 words)

	Physics Department Faculty: John M. LoSecco (Site not responding. Last check: 2007-11-02)
		Among them is the existence of a class of particles known as exotics.
		These particles are exotic in that they do not exist in the standard quark model.
		Searches for exotics have produced candidates but no truly confirmed exotic states are known.
	www.physics.nd.edu /Faculty/losecco.html (309 words)

	Science News (Site not responding. Last check: 2007-11-02)
		New York - Physicists have found evidence for an unusual new kind of subatomic particle that may help them explain how the universe is stuck together.
		After a three-decade search, the world's fisrt "exotic meson" has been detected in a particle accelerator at the Brookhaven National Laboratory in Upton, N.Y. Physicists announce the detection in today's issue of Physics Review Letters.
		In the standard model of physics, a theoretical body of knowledge that has accumulated over 30 years, three quarks make a proton or neutron and two can combine to make another subatomic particle known as a meson.
	www.jlab.org /news/internet/1997/subatomic.html (108 words)

	Citebase - Chiral Extrapolations and Exotic Meson Spectrum (Site not responding. Last check: 2007-11-02)
		Authors: Thomas, Anthony W. czepaniak, Adam P. We examine the chiral corrections to exotic meson masses calculated in lattice QCD.
		In particular, we ask whether the non-linear chiral behavior at small quark masses, which has been found in other hadronic systems, could lead to large corrections to the predictions of exotic meson masses based on linear extrapolations to the chiral limit.
		We find that our present understanding of exotic meson decay dynamics suggests that open channels may not make a significant contribution to such non-linearities whereas the virtual, closed channels may be important.
	citebase.eprints.org /cgi-bin/citations?id=oai:arXiv.org:hep-ph/0106080 (154 words)

	Meson Spectroscopy and the Search for Exotics (ResearchIndex) (Site not responding. Last check: 2007-11-02)
		There is currently strong evidence that a scalar glueball mixed into the normal scalar mesons has been found.
		INTRODUCTION In the context of this paper I will review the current status of exotic mesons; glueballs and hybrid mesons.
		The Scalar Glueball and the - Mesons Christoph
	citeseer.ifi.unizh.ch /2612.html (300 words)

	Recent Conference Porceedings from the Crystal Barrel
		Light Quark Meson Spectroscopy with the Crystal Barrel Presented by Peter Bluem.
		An Experimental Overview of Meson Spectroscopy Data Presented by Curtis A. Meyer.
		Study of E/iota decay to eta pi pi in antiproton proton annihilation to 4pi eta, presented by David Urner.
	www-meg.phys.cmu.edu /cb/conf.html (521 words)

	Notre Dame Magazine, Winter 1997-98, Atom glue (Site not responding. Last check: 2007-11-02)
		The experiment elated scientists because it yielded the first concrete proof that the long- suspected "exotic meson" really exists.
		Whereas protons and neutrons are made of three-quark combinations and ordinary mesons are a quark-antiquark amalgam, the physicists saw evidence for an exotic meson made of either two quarks and two anitquarks or a hybrid of quark, antiquark, and gluon, another elementary particle that carries the strong force.
		The discovery of the exotic meson is a "very important benchmark" that will "set the mathematical scales for future experimentation and theoretical study," said Ted Barnes, an Oak Ridge National Laboratory physicist and professor of physics at the University of Tennessee.
	www.nd.edu /~ndmag/ilm2w97.html (292 words)

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