QCD sum rules for {rho} mesons in vacuum and in-medium, re-examined
Journal Article
·
· Physical Review. C, Nuclear Physics
- Physik-Department, Theoretische Physik, Technische Universitaet Muenchen, D-85747 Garching (Germany)
- Center for Theoretical Physics, Laboratory for Nuclear Science, Massachusetts Institute of Technology Cambridgea, Massachusetts 02139 (United States)
An updated investigation of QCD sum rules for the first two moments of {rho}-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.
- OSTI ID:
- 21199391
- Journal Information:
- Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 78; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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