Probing the strange quark condensate by di-electrons from φ-meson decays in heavy-ion collisions at SIS energies |
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Authors: | B. Kämpfer O.P. Pavlenko S. Zschocke |
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Affiliation: | (1) Forschungszentrum Rossendorf, PF 510119 - 01314 Dresden, Germany, DE;(2) Institute for Theoretical Physics, 03143 Kiev - 143, Ukraine, UA |
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Abstract: | QCD sum rules predict that the change of the strange quark condensate 〈ˉss〉 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 〈ˉss〉. This allows to probe directly in-medium modifications of 〈ˉss〉 via di-electron spectra in heavy-ion collisions at SIS energies with HADES. Received: 22 November 2002 / Accepted: 30 January 2003 / Published online: 29 April 2003 |
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Keywords: | PACS. 25.75.-q Relativistic heavy-ion collisions – 14.60.-z Leptons – 14.60.Cd Electrons (including positrons) |
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