129 research outputs found

    General Structure of Relativistic Vector Condensation

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    We study relativistic massive vector condensation due to a non zero chemical potential associated to some of the global conserved charges of the theory. We show that the phase structure is very rich. More specifically there are three distinct phases depending on the value of one of the zero chemical potential vector self interaction terms. We also develop a formalism which enables us to investigate the vacuum structure and dispersion relations in the spontaneously broken phase of the theory. We show that in a certain limit of the couplings and for large chemical potential the theory is not stable. This limit, interestingly, corresponds to a gauge type limit often employed to economically describe the ordinary vector mesons self interactions in QCD. We finally indicate for which physical systems our analysis is relevant.Comment: RevTex4 14 pages,4 figure

    Tau mesonic decays and strong anomaly of PCAC

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    Strong anomaly of the PCAC is found in τωππν\tau\rightarrow\omega \pi\pi\nu and ωρν\omega\rho\nu in the chiral limit. It originates in WZW anomaly. Theoretical result of τωππν\tau\rightarrow\omega\pi\pi\nu agrees with data well and the measurement of τωρν\tau\rightarrow\omega\rho\nu will confirm the strong anomaly of PCAC. The strong anomaly of PCAC is studied.Comment: 27 page

    Wilsonian Matching of Effective Field Theory with Underlying QCD

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    We propose a novel way of matching effective field theory with the underlying QCD in the sense of a Wilsonian renormalization group equation (RGE). We derive Wilsonian matching conditions between current correlators obtained by the operator product expansion in QCD and those by the hidden local symmetry (HLS) model. This determines without much ambiguity the bare parameters of the HLS at the cutoff scale in terms of the QCD parameters. Physical quantities for the pi and rho system are calculated by the Wilsonian RGE's from the bare parameters in remarkable agreement with the experiment.Comment: 13 pages, 4 figures, Minor corrections. This is the version to appear in Physical Review

    Remarks on the Hadronic Effect in Muon g2g-2: Low Energy Behavior of V0V^0 -π+\pi^+ Scattering

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    The behavior of the V0V^0-π+\pi^+ scattering amplitude (where V0=ρ0,ωV^0 = \rho^0 , \omega , or ϕ\phi) in the low pion momentum limit is studied motivated by its relevance to the theory of muon g2g - 2. Current algebra analysis shows that its S-wave component must vanish in the chiral limit under general physical assumptions. We confirm this result with various low energy models of vector meson. Our result justifies the calculation of the charged pion loop part of the hadronic light-by-light scattering contribution to muon g2 g-2 within the framework of hidden local symmetry model of low energy hadron dynamics.Comment: 12 pages, REVTEX, 4 figures, Title and some other minor changes ( to appear in Phys. Rev. D

    Fate of Vector Dominance in the Effective Field Theory

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    We reveal the full phase structure of the effective field theory for QCD, based on the hidden local symmetry (HLS) through the one-loop renormalization group equation including quadratic divergences. We then show that vector dominance (VD) is not a sacred discipline of the effective field theory but rather an accidental phenomenon peculiar to three-flavored QCD. In particular, the chiral symmetry restoration in HLS model takes place in a wide phase boundary surface, on which the VD is realized nowhere. This suggests that VD may not be valid for chiral symmetry restoration in hot and/or dense QCD.Comment: 4 pages, 3 figures. One reference added. Minor modification to shorten the manuscript. This is the version to appear in Physical Review Letter

    Effective chiral Lagrangians for spin-1 mesons

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    The commonly used types of effective theory for vector mesons are reviewed and their relationships clarified. They are shown to correspond to different choices of field for spin-1 particles and the rules for transforming between them are described. The importance of respecting chiral symmetry is stressed. The choice of fields that transform homogeneously under the nonlinear realisation of chiral symmetry imposes no preconceptions about the types of coupling for the mesons. This representation thus provides a convenient framework for relating different theories. It is also used to elucidate the nature of the assumptions in specific hidden-gauge and massive Yang-Mills models that have been widely used.Comment: 46 pages (RevTeX

    Role of Light Vector Mesons in the Heavy Particle Chiral Lagrangian

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    We give the general framework for adding "light" vector particles to the heavy hadron effective chiral Lagrangian. This has strong motivations both from the phenomenological and aesthetic standpoints. An application to the already observed D \rightarrow \overbar{K^*} weak transition amplitude is discussed.Comment: 19 pages, LaTeX documen

    Vacuum stability and the Cholesky decomposition

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    We discuss how the Cholesky decomposition may be used to ascertain whether a critical point of the field theory scalar potential provides a stable vacuum configuration. We then use this method to derive the stability conditions in a specific example.Comment: 7 page
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