Restoration of chiral symmetry and vector meson in the generalized hidden local symmetry
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Restoration of chiral symmetry and vector meson in the generalized hidden local symmetry. Munehisa Ohtani (RIKEN) Osamu Morimatsu ( KEK ). Yoshimasa Hidaka(TITech). Based on Phys. Rev. D73 ,036004(2006). Outline. Introduction Vector meson in the medium

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Restoration of chiral symmetry and vector meson in the generalized hidden local symmetry

Restoration of chiral symmetry and vector meson in the generalized hidden local symmetry

Munehisa Ohtani (RIKEN)

Osamu Morimatsu(KEK)

Yoshimasa Hidaka(TITech)

Based on Phys. Rev. D73,036004(2006)


Outline
Outline generalized

  • Introduction

    • Vector meson in the medium

    • Restoration pattern of chiral symmetry

  • Chiral restoration: π, ρ and A1 system

    • Generalized Hidden Local Symmetry(GHLS)

    • Restoration patterns

  • Summary

Yoshimasa Hidaka


Introduction
Introduction generalized

QCD phase diagram

Restorationof chiral symmetry

medium

Lepton pair

Yoshimasa Hidaka


Restoration of chiral symmetry
Restoration of chiral symmetry generalized

Dropping Masses

Spectral function

Spectral function

QSR, B-R scaling….

Hatsuda-Lee, Brown-Rho….

Mass

Mass

Melting Resonances

Spectral function

becomes larger by interaction with medium particle

Rapp-Wambach, Asakawa-Ko, .....

Mass

Yoshimasa Hidaka


Experiment
Experiment generalized

•p-Au, Pb-Au [email protected]

KEK-PS E325

excess

excess

nucl-ex/0504016

Phys. Lett. 405(1998)

Yoshimasa Hidaka


Na60 and our calculation
NA60 and our calculation generalized

NA60

ρspetrumin the HLS model with OPT

Chiral limit

Y.H. Ph.D Thesis(2005)

By E. Scomparin’s [email protected]

Yoshimasa Hidaka


Restoration scenario of chiral symmetry
Restoration Scenario of Chiral symmetry generalized

Helicity zero state

Experiment:

(F. J. Gilman and H. Harari (1968), S. Weinberg(1969))

Which representation does the pion belong at restoration point ?

Chiral partner of π

Vector meson(longitudinal)ρ

Chiral partner of π

Scalar mesonσ

Vector Manifestation scenario

Standard scenario

(Harada, Yamawaki(2001))

Yoshimasa Hidaka


Necessity of a 1
Necessity of A generalized 1

Vector Manifestation with Hidden Local Symmetry model(π, ρ)

Large-Nf(Harada and Yamawaki)

Finite-T(Harada and Sasaki)

Finite-μ(Harada, Kim and Rho)

chiral partner

ρ pairs with A1 in the standard scenario.

chiral partner

mixing

(F. J. Gilman and H. Harari (1968), S. Weinberg(1969))

mixing angle

The STAR Ratio

A1 plays important role.

(Brown, Lee and Rho nurcl-th/0507073)

It is necessary to incorporate A1.

Yoshimasa Hidaka


Generalized hidden local symmetry bando kugo yamawaki 198 5
Generalized generalized Hidden Local Symmetry(Bando, Kugo, Yamawaki (1985))

The GHLS model is an effective model based on the non-linear sigma model

including π, ρand A1.

Chiral symmetry

π:NG bosons associated with global chiral symm. breaking.

ρ, A1 : Gauge bosons

σ, p:NG bosons associated with local chiral symm. breaking.

       ⇒ σ and p are absorbed by the ρ and A1.

Yoshimasa Hidaka


Generalized hidden local symmetry
Generalized generalized Hidden Local Symmetry

The Lagrangian at lowest order

parameters

Decay constants

masses

ρππ coupling

π-A1 mixing

γ: mixing parameter betweenπ and A1

Yoshimasa Hidaka


Restoration pattern in the ghls model
Restoration Pattern in the GHLS model generalized

The vector and axial vector current correlators

Restoration condition

This condition should be satisfied for all energy scale.

Renormalization group invariance at restoration point.

Yoshimasa Hidaka


Renormalization Group Equations generalized

One-loop diagrams

RGEs are given by calculating these diagrams.

Yoshimasa Hidaka


Renormalization Group Equations generalized

Renormalization Group Equations

Yoshimasa Hidaka


Restoration Pattern generalized

Restoration condition and renormalization invariance

Mixing angle

Yoshimasa Hidaka


Pion form factor and vmd
Pion form factor and VMD generalized

VMD

Standard fixed point

VM fixed point

Intermediate fixed point

Yoshimasa Hidaka


Decay width
Decay width generalized

The rho-pi-pi coupling becomes weak due to .

ρbecomes stable.

Dileption emission

A narrow ρ peak but weak magnitude in the pion background will be observed.

The difference of restoration patterns will appear as a quantity of pion background and how the rho meson becomes narrow.

Yoshimasa Hidaka


Summary
Summary generalized

  • We have studied the restoration patterns of the chiral symmetry in GHLS model including A1 in addition to π and ρ.

  • By including A1 we have found three possibilities of the restoration patterns,

    • the Standard

    • VM

    • Intermediate

  • Both ρ and A1 masses drop in all scenarios

  • These three scenarios are different in the violation of the vector meson dominance.

  • Further analysis

    • finite temperature and/or density,

    • Large-Nf.

Yoshimasa Hidaka


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