Vector dominance model at finite temperature

Charles Gale, Joseph I. Kapusta

Research output: Contribution to journalArticle

293 Scopus citations


The neutral ρ{variant}-meson propagator is computed at finite temperature using standard π-ρ dynamics. The vector dominance model states that the hadronic electromagnetic current operator is proportional to a linear combination of the neutral vector meson field operators. Neglecting the φ-ω complex, this should give a good account of the rate of lepton pair emission from a hot pion gas. The mass and width of both transverse and longitudinal ρ{variant}-mesons increase with temperature, but temperature effects are still relatively small up to T = 150 MeV. If substantial shifts in these quantities were to be seen experimentally, it would seem to require other new physics like chiral symmetry restoration or deconfinement. The results obtained here may be viewed as generalizing the Gounaris-Sakurai formula to finite temperature.

Original languageEnglish (US)
Pages (from-to)65-89
Number of pages25
JournalNuclear Physics, Section B
Issue number1
StatePublished - Jun 24 1991

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