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Abstract: Finite energy sum rules for vector and axial-vector currents are derived in athermal medium to provide constraints for the spectral behavior of rho and a1mesons at nonvanishing temperature and hence to study the tendency towardchiral symmetry restoration. The parity-mixing ansatz for the rho and a1spectra, including finite widths, is investigated as a function of temperature.Characteristic differences between vector and axial-vector channels arediscussed with regard to the implementation of the chiral-symmetry-breakingscale, 4pi times the pion decay constant, in the sum rule approach.



Autor: Youngshin Kwon, Chihiro Sasaki, Wolfram Weise

Fuente: https://arxiv.org/







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