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Topic: Strong CP problem

Related Topics

CKM matrix

GZK cutoff

Hadron

List of particles

Weak nuclear force

Large Hadron Collider

Neutrino

Kaon

CPT symmetry

	Twisted Split Fermions, Flavor and the Strong CP problem
		The framework of split fermions [Arkani-Hamed and Schmaltz] explain the flavor hierarchies in the standard model without invoking symmetries by generating small overlaps between wavefunctions in an extra dimension.
		Furthermore, the twist introduces a new source of CP violation which may be used to explain the smallness of the strong CP phase in a model of spontaneous CP breaking.
		The framework of twisted split fermions can thus solve the Flavor and Strong CP problems in conjunction.
	hep.bu.edu /abstracts/harnik-nov-04.html (136 words)

	Strong CP problem - Wikipedia, the free encyclopedia
		In particle physics, the strong CP problem is the puzzling question why Quantum chromodynamics (QCD) does not seem to break the CP-symmetry.
		This is a problem because at the end, there are natural terms in the QCD Lagrangian that are able to break the CP-symmetry.
		The most famous solution that has been proposed to solve the strong CP problem is the Peccei-Quinn theory, involving new scalar particles called axions.
	en.wikipedia.org /wiki/Strong_CP_problem (279 words)

	CP-symmetry - Wikipedia, the free encyclopedia
		The CP violation of the Standard model is incorporated by including a complex phase in the CKM matrix.
		The strong CP problem is the question of why no such violation is detected even though the theory in principle allows for it.
		CP violation is also necessary to trace the ways in which charge symmetry and parity symmetry are both simultaneously violated in hopes of explaining various natural phenomena, such as the discrepancy in the amounts of matter and anti-matter are present in the universe.
	en.wikipedia.org /wiki/CP-symmetry (760 words)

	Axion - Wikipedia, the free encyclopedia
		The axion is a hypothetical exotic particle postulated by Peccei-Quinn theory to resolve the strong-CP problem in quantum chromodynamics (QCD).
		This is never observed in practice, and the axion was postulated to be a particle (specifically a pseudo-Goldstone boson) associated with a new broken symmetry of nature, whose conservation is constructed to exclude all CP-violating terms from QCD.
		Observational studies to detect dark matter axions are underway, but they are not yet sufficiently sensitive to probe the mass regions where axions would be expected to be found if they are the solution to the dark matter problem.
	en.wikipedia.org /wiki/Axion (364 words)

	Search for EDM in atoms, molecules and the neutron. CP and T Violation in atomic physics.
		In a general field theory, CP violation is caused by the presence of a complex phase between different fundamental fields.
		Although the CP violation is explained naturally by the CKM matrix, it is not possible at present to check the self-consistency of this explanation.
		The role of CP symmetry in the theory of strong interactions is also not well understood.
	www.phys.washington.edu /users/wcgriff/romalis/EDM (1319 words)

	CP \| TutorGig.co.uk Encyclopedia (Site not responding. Last check: 2007-10-13)
		CP M 86 was a version of the CP M operating system for the Intel 8086.
		CP Puppis or Nova Puppis 1942 was a bright nova occurring in the constellation Puppis in 1942.
		CP symmetry is a symmetry obtained by a combination of the C symmetry and the P symmetry.
	www.tutorgig.co.uk /encyclopedia/sencyclo.jsp?keywords=CP (470 words)

	Physics Today Online - Books
		CP violation in the B system will be probed in much more detail at dedicated electronpositron "B Factories" newly in operation at three laboratories in the United States and Japan.
		(The puzzling fact that CP appears to be conserved by the strong interactions is known as the strong-CP problem.) The most sensitive way to probe CP violation is to study asymmetries in the decays of B and K mesons and their antiparticles, and this is the experimental program of the coming decade.
		Disentangling the effects of the strong interactions is the central theoretical problem of B and K physics.
	www.aip.org /pt/vol-53/iss-8/p50.html (988 words)

	CKM Matrix Encyclopedia Article, Definition, History, Biography (Site not responding. Last check: 2007-10-13)
		On the left is the CKM Matrix along with a vector of strong force eigenstates of the quarks, and on the right is the weak force eigenstates of the quarks.
		For two generations of quarks, there are no CP violating phases, as shown by the counting of the previous section.
		Since CP violations were seen in neutral kaon decays already in 1964, the emergence of the standard model soon after was a clear signal of the existence of a third generation of quarks, as pointed out in 1973 by Kobayashi and Maskawa.
	www.greatartworks.com /encyclopedia/CKM_matrix (934 words)

	Strong - Wikipedia, the free encyclopedia
		Magnus the Strong (1106–1134), Danish prince, pretender to the throne
		Maurice Strong (1929—), Canadia industrialist, Secretary-General of the UN Earth Summit
		Strong Memorial Hospital, hospital at University of Rochester Medical Center in Rochester, New York, USA
	en.wikipedia.org /wiki/Strong (344 words)

	[No title] (Site not responding. Last check: 2007-10-13)
		By assuming CP is spontaneously broken in the bulk, a weak CKM phase is created in the standard model due to a twisting in flavor space of the bulk fermion wavefunctions.
		But the strong CP phase remains zero, being essentially protected by parity in the bulk and CP on the branes.
		As always in models of spontaneous CP breaking, radiative corrections to theta bar from the standard model are tiny, but even higher dimension operators are not that dangerous.
	www.thphys.uni-heidelberg.de /cgi-bin/abstracts/hep-ph:0411132 (150 words)

	Annotated Physics Encyclopædia: Electroweak theory and Standard Model
		CP violation - a bit technical overview, with emphasis on B decays.
		QCD, Strong CO and Axions - (hep-ph/9606475), By R.Peccei - long standing and still unresolved problem of CP non-violation in strong interactions.
		CP violation in B decays - (hep-ph/9904271), 50pp, by Y.Nir.
	web.mit.edu /redingtn/www/netadv/hep-ew.html (537 words)

	Definition of index.php?search=Year\|2000\|problem&limit=20&offset=20 (Site not responding. Last check: 2007-10-13)
		1:...], '''andldquo;the problem of evilandrdquo;''' is the problem of reconciling the existence of [[evil]] or suffe...
		The problem is solved by the hypothesis of an inflationary un...
		Whitehead problem was the first purely algebraic problem that was shown to be undecidable.
	www.wordiq.com /knowledge/index.php?search=Year%7C2000%7Cproblem&limit=20&offset=20 (1030 words)

	Theoretical Physics
		Problems in biology, such as, for instance, the human genome or the brain, are increasingly attracting the attention of physicists.
		Of equal importance is high energy physics including the standard model of particle phenomenology and its extension to accommodate neutrino mass, CP violation and aspects of gravity and cosmology.
		Departmental efforts focus on theory, in particular extensions of the standard model with regard to the mass of the neutrino and the strong CP problem.
	www.physics.unc.edu /research/theory/index.php (337 words)

	Axion (Site not responding. Last check: 2007-10-13)
		The axion is a hypothetical particle postulated by Peccei-Quinn theory to the strong-CP problem in quantum chromodynamics (QCD).
		This is never observed in practice the axion was postulated to be a (specifically a pseudo-Goldstone boson) associated with a broken symmetry of nature whose conservation is to exclude all CP-violating terms from QCD.
		Observational studies to detect dark matter are underway but they are not yet sensitive to probe the mass regimes where would be expected to be found if are the solution to the dark matter problem.
	www.freeglossary.com /Axion (424 words)

	[No title] (Site not responding. Last check: 2007-10-13)
		The Strong CP problem is essentially: why does the neutron have no electric dipole moment?
		The nontrivial topological structure (details?) of the QCD gauge vacuum generates a CP breaking term in the QCD Lagrangian: \begin{equation} \mathcal{L} = \bar{\theta} {1 \over 16 \pi^2} F_{\mu\nu}^a \tilde{F}^{\mu\nu a} \end{equation} where: \begin{equation} \tilde{F}^a_{\mu\nu} = {1 \over 2} \epsilon_{\mu\nu\rho\sigma} F^{\rho\sigma a}.
		The unnatural smallness of $\bar{\theta}$ is the strong CP problem.
	www.mcelrath.org /Notes/StrongCP/src (135 words)

	axion
		Its existence would resolve what is known as the strong-CP problem in quantum chromodynamics.
		The two most sensitive ongoing experimental searches for axions rely on the so-called "Primakov effect," i.e., the coupling of the axion to two photons, one of them virtual or "man-made" provided by a strong electric or magnetic field, and the second being the detectable signal.
		A high-Q resonant microwave cavity immersed in a strong superconducting magnet (a left over from a "star wars" project) is operated at Lawrence Livermore National Laboratory (LLNL), where it slowly scans microwave frequencies looking for axions in the narrow mass region over which they would constitute good galactic dark matter candidates.
	www.daviddarling.info /encyclopedia/A/axion.html (260 words)

	Quantum_chromodynamics (Site not responding. Last check: 2007-10-13)
		Because of its special property called asymptotic freedom, it was first proposed in the early 1970s by David Politzer and by Frank Wilczek and David Gross as a theory to understand the structure of protons, neutrons, and similar particles.
		According to this theory, the character of the strong interaction is determined by a special symmetry between the color charges of the quarks.
		This symmetry is known as the SU(3) gauge group, and the quarks transform under this group as SU(3) triplet Dirac fields.
	goc.subdomain.de /Quantum_chromodynamics (287 words)

	Open Questions: CP Symmetry Violation
		Total CP violation is interpreted as value of a spinless quantum field of the axion.
		An analogy illuminates the problem of CP symmetry violation and helps explain the search for the hypothetical axion particle, which may be a component of cosmic dark matter.
		A very slight violation of CP symmetry is known to exist, and the existence of matter in the universe seems to depend on it.
	openquestions.com /oq-ph006.htm (596 words)

	Careers with DemandTec
		He or she will work closely with other team members to understand specific project requirements and the needs of the team as a whole, and then design, build, and test technical solutions that are reliable, scalable, and easy to maintain.
		He or she must be able to handle multiple priorities, be very flexible and work well with others with minimum supervision in a fast paced, dynamic environment.
		A strong performer in the Analyst role can be expected to grow into the Senior Analyst role and assist in managing and developing other new analysts.
	www.demandtec.com /company/careers/professional_services.htm (1516 words)

	Keung's work
		CP violation in the cubic coupling of neutral gauge bosons.
		CP asymmetry in the Higgs decay into the top pair due to the stop mixing.
		CP violation as a consequence of quantum mechanics.
	tigger.uic.edu /~keung/pub.html (1499 words)

	Axion Footwear -- Recommendations and Resources (Site not responding. Last check: 2007-10-13)
		If the hypothetical axions exist, they may be produced in the Sun's core when X-rays scatter off electrons and protons in the presence of strong electric fields.
		The experimental setup is built around a 9.26 meter long LHC magnet capable of producing a field of up to 9.5 teslas.
		This strong magnetic field is expected to convert solar axions back into X-rays for subsequent detection by X-ray detectors.
	www.becomingapediatrician.com /health/9/axion-footwear.html (1243 words)

	Luboš Motl's reference frame: Terasymmetry
		The usual CP symmetry is not imposed at any level.
		Because the terafermions are heavy - where the masses softly break the terasymmetry - the strong CP violation is naturally eliminated and the theta angle is small.
		After a quick look, I agree that such an approach is a rather natural answer to the strong CP problem - but I may change my mind after more careful considerations.
	motls.blogspot.com /2005/05/terasymmetry.html (367 words)

	Robert G. Sachs
		One of the greatest mysteries of physics is the origin of the observed CP violation by the weak interactions.
		This is the Strong CP Problem, called that because it requires that theta and the chiral phase vanish separately unless there is a cancellation between the two, which is viewed as an exceptional accident.
		It has been shown that this scenario for CP violation leads to effects that are distinct enough to falsify the theory.
	physics.uchicago.edu /rgs.html (1350 words)

	ICTP Preprints Abstract List (Site not responding. Last check: 2007-10-13)
		ABSTRACT: After promoting the phases of the soft masses to dynamical fields corresponding to Goldstone bosons of spontaneously broken global symmetries in the supersymmetry breaking sector, the next-to-minimal supersymmetric model is found to solve the $\mu$ problem and the strong CP problem simultaneously with an invisible axion.
		Consequently, the solution of the supersymmetric CP problem may require heavy enough superpartners and nonminimal flavor structures, where the latter may be also relevant for avoiding the formation of axionic domain walls.
		Observation of supersymmetric contributions to CP asymmetries in B decays would hint at a non-flavor blind mechanism of supersymmetry breaking.
	www.ictp.trieste.it /ictp/preprints/1999LIST_15.html (1594 words)

	NYU Physics High Energy Physics Seminars (Site not responding. Last check: 2007-10-13)
		One of the puzzles in particle physics is the conservation of CP symmetry in strong interactions.
		After reviewing the strong CP problem I will discuss whether recent proposals of brane worlds and extra dimensions can provide its solution.
		I will elaborate on the proposal that the observed acceleration of the Universe is the result of the backreaction of cosmological perturbations, rather than the effect of a negative-pressure dark-energy fluid or a modification of general relativity.
	www.physics.nyu.edu /cgi-bin/hep (1057 words)

	Physics Help and Math Help - Physics Forums - CP violation
		Recall Boltzmann caused quite a stink claiming to derive t-asymmetric entropy from t-symmetric elementary physics.) These symmetries are denoted by the captal letters C, P, and T. CP symmetry would be one where failure of either charge symmetry or parity symmetry would be tolerated but not both at the same time.
		CP violation would be an observed case where they both were violated in the same interaction.
		In one realization of this idea, CP is violated in the mass matrix of heavy majorana neutrinos.
	www.physicsforums.com /printthread.php?t=68934 (950 words)

	Re: Strong CP Problem
		As far as I could gather from a > > quick reading the problem is still wide open, however some very tight > > constraints have been imposed on some proposed solutions (i.e.
		A massless axion from the broken axial U(1) symmetry couples to topological charge (FFdual) and eliminates CP violation in precisely the way Samuel hoped long-range interactions between instantons would.
		In this sense, an axion or a massless quark eliminate CP violation in precisely the same way, and in a way that does not require any chiral rotation to eliminate the CP violating angle through the chiral anomaly.
	www.lns.cornell.edu /spr/1999-04/msg0016031.html (431 words)

	Citebase - Solution of the strong CP problem
		(c) CP violation in D decays: We describe the consequences of CP violation from new physics in D-D mixing.
		CP violation in B mesons using Dalitz plot asymmetries [ Abstract/Citations, Cached PDF ]
		These new kind of asymmetries are constructed by adding B and {B} events, and do not require flavor or time tagging, nor is the presence of...
	www.citebase.org /cgi-bin/citations?id=oai:arXiv.org:hep-ph/9611266 (663 words)

	Non-thermal Relics as Dark Matter (Axions)
		This is the strong CP problem, and one way to resolve this
		to zero, solving the strong CP problem, and the curvature of the potential means the axion now
		strong CP problem, and several groups are mounting laboratory
	web.mit.edu /%7Eredingtn/www/netadv/specr/345/node3.html (477 words)

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