Enhancement of the dielectron continuum in sqrt{s_NN} = 200 GeV Au+Au collisions
Enhancement of the dielectron continuum in sqrt{s_NN} = 200 GeV Au+Au collisions
复制标题
sqrt{s_NN} = 200 GeV Au Au 碰撞中双电子连续体的增强
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
E. al.
中科院分区：
文献类型：
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作者：
Phenix Collaboration;S. Afanasiev;E. al.
PHENIX实验测量了sqrt{s_NN} = 200gev Au+Au碰撞中的介电子连续体。在最小偏置碰撞中，质量范围在150和750mev /c^2之间的介电子产率提高了3.4 +/- 0.2倍（stat）。+ / - 1.3(系统)。+/- 0.7（模型）与我们的强子衰变模型的期望相比。随着碰撞中心的增加，综合产额的增加速度要快于参与核子的数量，这表明在高温和稠密的介质中散射过程是发射的。π介子和J/psi介子质量之间的连续产率与相关c-cbar产生的预期一致，尽管不排除其他机制。
The PHENIX experiment has measured the dielectron continuum in sqrt{s_NN} = 200 GeV Au+Au collisions. In minimum bias collisions the dielectron yield in the mass range between 150 and 750 MeV/c^2 is enhanced by a factor of 3.4 +/- 0.2(stat.) +/- 1.3(syst.) +/- 0.7(model) compared to the expectation from our model of hadron decays. The integrated yield increases faster with the centrality of the collisions than the number of participating nucleons, suggesting emission from scattering processes in the hot and dense medium. The continuum yield between the masses of the phi and the J/psi mesons is consistent with expectations from correlated c-cbar production, though other mechanisms are not ruled out.