Vector meson spectral functions in a coarse-graining approach

  • Dilepton production in heavy-ion collisions at top SPS energy is investigated within a coarse-graining approach that combines an underlying microscopic evolution of the nuclear reaction with the application of medium-modified spectral functions. Extracting local energy and baryon density for a grid of small space-time cells and going to each cell’s rest frame enables to determine local temperature and chemical potential by application of an equation of state. This allows for the calculation of thermal dilepton emission. We apply and compare two different spectral functions for the ρ: A hadronic many-body calculation and an approach that uses empirical scattering amplitudes. Quantitatively good agreement of the model calculations with the data from the NA60 collaboration is achieved for both spectral functions, but in detail the hadronic many-body approach leads to a better description, especially of the broadening around the pole mass of the ρ and for the low-mass excess. We further show that the presence of a pion chemical potential significantly influences the dilepton yield.

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Metadaten
Author:Stephan EndresORCiDGND, Hendrik van HeesORCiDGND, Janus WeilORCiD, Marcus BleicherORCiDGND
URN:urn:nbn:de:hebis:30:3-719234
DOI:https://doi.org/10.1051/epjconf/20159700014
ISSN:2100-014X
Parent Title (English):EPJ Web of Conferences
Publisher:EDP Sciences
Place of publication:Les Ulis
Document Type:Article
Language:English
Date of Publication (online):2015/06/22
Date of first Publication:2015/06/22
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Contributing Corporation:Resonance Workshop at Catania
Release Date:2023/02/01
Volume:97
Issue:00014
Page Number:10
HeBIS-PPN:506628612
Institutes:Physik / Physik
Wissenschaftliche Zentren und koordinierte Programme / Frankfurt Institute for Advanced Studies (FIAS)
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 4.0