The search for in-medium modifications of mesons—experimental status

Metag, Volker

doi:doi:10.1063/1.3542034

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AIP Conference Proceedings / Volume 1322

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The search for in-medium modifications of mesons—experimental status

AIP Conf. Proc. 1322, pp. 73-83; doi:http://dx.doi.org/10.1063/1.3542034 (11 pages)

INTERNATIONAL WORKSHOP ON CHIRAL SYMMETRY IN HADRONS AND NUCLEI

Date: 21–24 June 2010

Location: Valencia, (Spain)

Volker Metag

II. Physikalisches Institut, Universitaet Giessen, D-35392, Germany

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Abstract

Related Content

Hadron properties in strongly interacting matter provide a link between experimental observables and Quantum Chromodynamics (QCD) in the strong coupling regime. According to QCD sum rules changes in chiral and higher order condensates, which may partially be associated with a restoration of chiral symmetry in the nuclear medium, lead to significant modifications in the low-energy spectrum of hadrons. Reactions with elementary probes and heavy-ion collisions have been used to extract experimental information on in-medium properties of hadrons, in particular on the light vector mesons ρ, ω, and ϕ. Almost all experiments report a softening of the spectral functions in the nuclear medium. The increase in width depends on the density and temperature of the hadronic environment. No evidence for mass shifts is found in the majority of experiments. Remaining inconsistencies among experimental results call for further measurements.

KEYWORDS and PACS

Keywords

hadronic atoms, quantum chromodynamics, meson photoproduction, baryon resonances

PACS

13.75.Cs

Nucleon-nucleon interactions (including antinucleons, deuterons, etc.)
12.38.Aw

General properties of QCD (dynamics, confinement, etc.)
13.60.Le

Meson production
14.20.Gk

Baryon resonances (S=C=B=0)