منابع مشابه
Light Vector Mesons in Nuclear Matter
We summarize the current theoretical and experimental status of the spectral changes of vector mesons (ρ, ω, φ) in nuclear medium. Various approaches including QCD sum rules, effective theory of hadrons and bag models show decreasing of the vector meson masses in nuclear matter. Possibility to detect the mass shift through lepton pairs in γ −A, p−A and A−A reactions are also discussed. Invited ...
متن کاملConstraints on vector mesons with finite momentum in nuclear matter
Using the QCD operator product expansion, we derive the real part of the transverse and longitudinal vector-vector correlation function with the quantum numbers of the ρ and ω mesons to leading order in density and three momentum (q2) for ω2 → −∞. The operator product expansion provides, through the Borel transformed energy dispersion relation, a model independent constraint for the momentum de...
متن کاملValid QCD sum rules for vector mesons in nuclear matter.
QCD sum rules for vector mesons (ρ, ω, φ) in nuclear matter are reexamined with an emphasis on the reliability of various sum rules. Monitoring the continuum contribution and the convergence of the operator product expansion plays crucial role in determining the validity of a sum rule. The uncertainties arising from less than precise knowledge of the condensate values and other input parameters...
متن کاملMeson-nucleon Scattering and Vector Mesons in Nuclear Matter *
The electromagnetic decay of the vector mesons into e+e− and μ+μ− pairs makes them particularly well suited for exploring the conditions in dense and hot matter in nuclear collisions. The lepton pairs provide virtually undistorted information on the mass distribution of the vector mesons in the medium. The lepton-pair spectrum in nucleus-nucleus collisions at SPS energies exhibits a low-mass en...
متن کاملFrom Meson-nucleon Scattering to Vector Mesons in Nuclear Matter
We employ meson-nucleon scattering data to deduce the properties of the low-mass vector mesons in nuclear matter, and present results for the ρ and ω in-medium spectral functions. The corresponding thermal emission rate for lepton pairs is also discussed.
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1996
ISSN: 0033-068X,1347-4081
DOI: 10.1143/ptp.95.1009