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arXiv 0711.2118nucl-ex
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在RHIC的PHENIX实验中对双轻子连续谱的测量

Measurements of dilepton continuum at the PHENIX experiment at RHIC

Alberica Toia

摘要:

PHENIX测量了sqrt(s_(NN))=200 GeV Au+Au和p+p碰撞中的双电子连续谱。在最小偏压Au+Au碰撞中,质量范围在150和750 MeV/c^2之间的双电子产额增加了3.4 +/- 0.2倍(统计)。+/- 1.3(系统)+/- 0.7(模型)与我们的强子衰变模型的预期相比,它很好地再现了p+p碰撞中的质谱。的集成产量增加更快的碰撞中心比参与核子的数量,表明在稠密介质中的散射过程的排放。φ介子和J/psi介子的质量之间的连续产额与相关ccbar产生的预期一致,尽管不排除其他机制。

英文摘要:

PHENIX has measured the dielectron continuum in sqrt(s_(NN))=200 GeV Au+Au and p+p collisions. In minimum bias Au+Au 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 that well reproduces the mass spectrum in p+p collisions. The integrated yield increases faster with the centrality of the collisions than the number of participating nucleons, suggesting emission from scattering processes in the dense medium. The continuum yield between the masses of the phi and the J/psi meson is consistent with expectations from correlated ccbar production, though other mechanisms are not ruled out.

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