QCD sum rules for ρ mesons in vacuum and in-medium, re-examined

Youngshin Kwon, Massimiliano Procura, Wolfram Weise

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

30 Zitate (Scopus)

Abstract

An updated investigation of QCD sum rules for the first two moments of ρ-meson spectral functions, both in vacuum and in-medium, is performed with emphasis on the role of the scale related to spontaneous chiral symmetry breaking in QCD. It is demonstrated that these lowest moments of vector current spectral distributions do permit an accurate sum-rule analysis with controlled input including QCD condensates of the lowest dimensions, whereas higher moments are subject to uncertainties from higher dimensional condensates. Possible connections with Brown-Rho scaling are discussed. The factorization approximation for four-quark condensates is shown not to be applicable in any of the cases studied.

OriginalspracheEnglisch
Aufsatznummer055203
FachzeitschriftPhysical Review C - Nuclear Physics
Jahrgang78
Ausgabenummer5
DOIs
PublikationsstatusVeröffentlicht - 12 Nov. 2008

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