Search results for "Chiral-symmetry"

showing 4 items of 4 documents

Confinement, the gluon propagator and the interquark potential for heavy mesons

2012

The interquark static potential for heavy mesons described by a massive one-gluon exchange interaction obtained from the propagator of the truncated Dyson-Schwinger equations does not reproduced the expected Cornell potential. I show that no formulation based on a finite propagator will lead to confinement of quenched QCD. I propose a mechanism based on a singular nonperturbative coupling constant which has the virtue of giving rise to a finite gluon propagator and (almost) linear confinement. The mechanism can be slightly modified to produce the screened potentials of unquenched QCD.

High Energy Physics - TheoryNuclear and High Energy PhysicsParticle physicsMesonHigh Energy Physics::LatticeFOS: Physical sciencesMechanism based01 natural sciencesHigh Energy Physics - Phenomenology (hep-ph)0103 physical sciences010306 general physicsPhysicsCoupling constantQuantum chromodynamics010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyExchange interactionPropagatorGluonHigh Energy Physics - PhenomenologyHigh Energy Physics - Theory (hep-th)Quark ConfinementChiral-Symmetry BreakingFísica nuclearHigh Energy Physics::ExperimentThe European Physical Journal A
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Charm and hidden charm scalar mesons in the nuclear medium

2009

We study the renormalization of the properties of low-lying charm and hidden charm scalar mesons in a nuclear medium, concretely of the D-s0(2317) and the theoretical hidden charm state X(3700). We find that for the D-s0(2317), with negligible width at zero density, the width becomes about 100 MeV at normal nuclear-matter density, while in the case of the X(3700) the width becomes as large as 200 MeV. We discuss the origin of this new width and trace it to reactions occurring in the nucleus, while offering a guideline for future experiments testing these changes. We also show how those medium modifications will bring valuable information on the nature of the scalar resonances and the mechan…

Nuclear and High Energy PhysicsParticle physicsTrace (linear algebra)Nuclear TheoryMesonNuclear TheoryScalar (mathematics)FOS: Physical sciencesCHIRAL-SYMMETRY RESTORATIONNuclear Theory (nucl-th)RenormalizationUNITARY APPROACHCharm (quantum number)Nuclear ExperimentNN INTERACTIONPhysicsHEAVY MESONSZero (complex analysis)FísicaLOCAL SYMMETRYMULTIQUARK HADRONSNuclear matterGAUGE BOSONPHI-PHOTOPRODUCTIONHigh Energy Physics::ExperimentPI-PI INTERACTIONNucleonVECTOR-MESONSThe European Physical Journal A
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Axial resonances in the open and hidden charm sectors

2007

13 pages, 2 figures.-- PACS nrs.: 11.10.St, 11.80.Gw, 12.39.Hg, 12.39.Fe.-- ISI Article Identifier: 000249271600001.-- ArXiv pre-print available at: http://arxiv.org/abs/0704.2314

PhysicsNuclear and High Energy PhysicsParticle physics[PACS] Chiral LagrangiansChiral-symmetryMeson resonancesHeavy mesons[PACS] Heavy quark effective theoryHigh Energy Physics::PhenomenologyFOS: Physical sciencesFísica[PACS] Bound and unstable states; Bethe-Salpeter equationsHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)[PACS] Multichannel scatteringBethe-Salpeter equationsHigh Energy Physics::ExperimentCharm (quantum number)Nuclear Experiment[PACS] Bound and unstable states
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In-medium modifications of the pi pi interaction in photon-induced reactions

2002

Differential cross sections of the reactions $(\gamma,\pi^\circ\pi^\circ)$ and $(\gamma,\pi^\circ\pi^++\pi^\circ\pi^-)$ have been measured for several nuclei ($^1$H,$^{12}$C, and $^{\rm nat}$Pb) at an incident-photon energy of $E_{\gamma}$=400-460 MeV at the tagged-photon facility at MAMI-B using the TAPS spectrometer. A significant nuclear-mass dependence of the $\pi\pi$ invariant-mass distribution is found in the $\pi^\circ\pi^\circ$ channel. This dependence is not observed in the $\pi^\circ\pi^{+/-}$ channel and is consistent with an in-medium modification of the $\pi\pi$ interaction in the $I$=$J$=0 channel. The data are compared to $\pi$-induced measurements and to calculations within …

PhysicsPhotonMesonPAIRSHadronCarbon-12General Physics and AstronomyElementary particleNONPERTURBATIVE APPROACHCHIRAL-SYMMETRY RESTORATIONPionNUCLEAR MEDIUMPiSPECTROMETERMESONAtomic physicsNuclear ExperimentNuclear ExperimentMATTERBoson
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