Thermal dilepton production from dropping {rho} based on the vector manifestation

Journal Article · Fri Dec 01 04:00:00 EST 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.74.114006· OSTI ID:20868086

Harada, Masayasu ^[1]; Sasaki, Chihiro ^[2]

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1. Department of Physics, Nagoya University, Nagoya, 464-8602 (Japan)
2. Gesellschaft fuer Schwerionenforschung (GSI), 64291 Darmstadt (Germany)

We study the pion electromagnetic form factor and the dilepton production rate in hot matter using the hidden local symmetry theory as an effective field theory for pions and {rho} mesons. In this framework, the chiral symmetry restoration is realized as the vector manifestation (VM) in which the massless vector meson becomes the chiral partner of the pion, giving a theoretical support to the dropping {rho} a la Brown-Rho scaling. In the VM, the vector dominance (VD) is strongly violated near the phase transition point associated with the dropping {rho}. We show that the effect of the violation of the VD substantially suppresses the dilepton production rate compared with the one predicted by assuming the VD together with the dropping {rho}.

• OSTI ID: 20868086
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 11 Vol. 74; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHIRAL SYMMETRY
CHIRALITY
ELECTROMAGNETIC FORM FACTORS
PAIR PRODUCTION
PHASE TRANSFORMATIONS
PIONS
QUANTUM FIELD THEORY
RHO-770 MESONS
VECTOR DOMINANCE MODEL