Vector mesons at finite temperature and QCD sum rules

Abstract

Finite energy sum rules for vector and axial-vector currents are derived in a thermal medium to provide constraints for the spectral behavior of rho and a1 mesons at nonvanishing temperature and hence to study the tendency toward chiral symmetry restoration. The parity-mixing ansatz for the rho and a1 spectra, including finite widths, is investigated as a function of temperature. Characteristic differences between vector and axial-vector channels are discussed with regard to the implementation of the chiral-symmetry-breaking scale, 4pi times the pion decay constant, in the sum rule approach.

9 pages, 6 figures

References in corpus (8)

• The QCD transition temperature: results with physical masses in the continuum limit
• The QCD transition temperature: results with physical masses in the continuum limit II.
• The QCD Equation of State with almost Physical Quark Masses
• The transition temperature in QCD
• The finite temperature QCD using 2+1 flavors of domain wall fermions at N_t = 8
• First measurement of the rho spectral function in nuclear collisions
• QCD sum rules for rho mesons in vacuum and in-medium, re-examined
• Vector-axialvector mixing from a chiral effective field theory at finite temperature

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• Quantitative sum rule analysis of low-temperature spectral functions
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