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

被引：10
作者：
Kämpfer, B
Pavlenko, OP
Zschocke, S
机构：
[1] Forschungszentrum Rossendorf EV, D-01314 Dresden, Germany
[2] Inst Theoret Phys, UA-03143 Kiev 143, Ukraine
来源：
EUROPEAN PHYSICAL JOURNAL A | 2003年 / 17卷 / 01期
关键词：
D O I：
10.1140/epja/i2002-10146-1
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
QCD sum rules predict that the change of the strange quark condensate <(s) over bars> in hadron matter at finite baryon density causes a shift of the peak position of the di-electron spectra from phi-meson decays. Due to the expansion of hadron matter in heavy-ion collisions, the phi 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 phi region. The emerging broadening is sensitive to the in-medium change of <(s) over bars>. This allows to probe directly in-medium modifications of <(s) over bars> via di-electron spectra in heavy-ion collisions at SIS energies with HADES.
引用
收藏
页码：83 / 87
页数：5
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