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Examinations of the early degrees of freedom in ultrarelativistic nucleus-nucleus collisions

机译：超微髓核碰撞中早期自由度的检查

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The parton-hadron string dynamics (PHSD) transport model is used to study the impact of the choice of initial degrees of freedom on the final hadronic and electromagnetic observables in Au+Au collisions at root s(NN) = 200 GeV. We find that a nonperturbative system of massive gluons (scenario I) and a system dominated by quarks and antiquarks (scenario II) lead to different hadronic observables when imposing the same initial energy-momentum tensor T-mu nu (x) just after the passage of the impinging nuclei. In case of the gluonic initial condition the formation of s, (s) over bar pairs in the quark-gluon plasma (QGP) proceeds rather slowly, such that the antistrange quarks and accordingly the K+ mesons do not achieve chemical equilibrium even in central Au+Au collisions at root s(NN) = 200 GeV. Accordingly, the K+ rapidity distribution is suppressed in the gluonic scenario, and is in conflict with the data from the BRAHMS Collaboration. The proton and antiproton rapidity distributions also disfavor scenario I. Furthermore, a clear suppression of direct photon and dilepton production is found for the pure gluonic initial conditions, which is not so clearly seen in the present photon and dilepton spectra from Au+Au collisions at root s(NN) = 200 GeV due to a large contribution from other channels. It is argued that dilepton spectra in the invariant mass range 1.2 < M < 3 GeV will provide a definitive answer once the background from correlated D-meson decays is subtracted experimentally.
机译：Parton-Hodron串动态（PHSD）传输模型用于研究初始RoTronic和电磁观察结果的初始自由度的影响，在根S（NN）= 200 GEV处的AU + AU碰撞中的最终重孔和电磁观察结果。我们发现，庞大泡沫（情景i）和由夸克和古董（方案II）主导的系统的非触发系统导致突起在通道之后相同的初始能量 - 动量张量T-MU nu（x）时达到不同的辐射观察。灭火的核。在普鲁隆初始条件的情况下，夸克 - 胶血管等离子体（QGP）中的S，（S）在Quark-Gluon等离子体（QGP）上的形成情况，使得反破坏夸克和相应的K + Mesons即使在Au中部也没有实现化学均衡+ Root s（nn）= 200 gev的碰撞。因此，在Gluonic场景中抑制了K +快速分布，并且与来自Brahms合作的数据冲突。质子和反罗本速度分布也不容涉及场景I.此外，对纯血糖初始条件发现了明确的直接光子和Dilepton生产的抑制，从Au + Au碰撞中的本发明的光子和Dilepton光谱中没有如此清楚地看到由于其他渠道的大贡献，根S（NN）= 200 GEV。有人认为，一旦实验中减去了来自相关的D-MESON衰变的背景，将提供一个明确的答案。

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