Advertisement

Probing the strange quark condensate by di-electrons from φ-meson decays in heavy-ion collisions at SIS energies

  • B. Kämpfer
  • O.P. Pavlenko
  • S. Zschocke

Abstract:

QCD sum rules predict that the change of the strange quark condensate 〈¯ss〉 in hadron matter at finite baryon density causes a shift of the peak position of the di-electron spectra from φ-meson decays. Due to the expansion of hadron matter in heavy-ion collisions, the φ peak suffers a smearing governed by the interval of density in the expanding fireball, which appears as an effective broadening of the di-electron spectrum in the φ region. The emerging broadening is sensitive to the in-medium change of 〈¯ss〉. This allows to probe directly in-medium modifications of 〈¯ss〉 via di-electron spectra in heavy-ion collisions at SIS energies with HADES.

PACS. 25.75.-q Relativistic heavy-ion collisions – 14.60.-z Leptons – 14.60.Cd Electrons (including positrons) 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Società Italiana di Fisica and Springer-Verlag 2003

Authors and Affiliations

  • B. Kämpfer
    • 1
  • O.P. Pavlenko
    • 1
  • S. Zschocke
    • 1
  1. 1.Forschungszentrum Rossendorf, PF 510119 - 01314 Dresden, GermanyDE

Personalised recommendations