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首页> 外文期刊>Physical Review C: Nuclear Physics >Analysis of dilepton production in Au+Au collisions at √sNN=200 GeV within the parton-hadron-string dynamics transport approach
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Analysis of dilepton production in Au+Au collisions at √sNN=200 GeV within the parton-hadron-string dynamics transport approach

机译：on-强子串动力学输运方法中√sNN= 200 GeV时Au + Au碰撞中的双核子产生

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摘要

We address dilepton production in Au+Au collisions at √sNN=200 GeV by employing the parton-hadron-string dynamics (PHSD) off-shell transport approach. Within the PHSD, one goes beyond the quasiparticle approximation by solving generalized transport equations on the basis of the off-shell Kadanoff-Baym equations for the Green's functions in the phase-space representation. The approach consistently describes the full evolution of a relativistic heavy-ion collision, from the initial hard scatterings and string formation, through the dynamical deconfinement phase transition to the quark-gluon plasma (QGP) as well as hadronization, to the subsequent interactions in the hadronic phase. With partons described in the PHSD by the dynamical quasiparticle model (DQPM)—matched to reproduce lattice QCD results in thermodynamic equilibrium—we calculate, in particular, the dilepton radiation from partonic interactions through the reactions qq̅ →γ*, qq̅ →γ*+g, and qg→γ*q (q̅ g→γ*q̅ ) in the early stage of relativistic heavy-ion collisions. By comparing our results to the data from the PHENIX Collaboration, we study the relative importance of different dilepton production mechanisms and point out the regions in phase space where partonic channels are dominant. Furthermore, explicit predictions are presented for dileptons within the acceptance of the STAR detector system and compared to the preliminary data.
机译：我们采用部分强子串动力学（PHSD）脱壳传输方法解决了在√sNN= 200 GeV的Au + Au碰撞中的双核子产生。在PHSD中，通过在相空间表示中格林函数的壳外Kadanoff-Baym方程的基础上求解广义输运方程，超越了准粒子逼近。该方法一致地描述了相对论重离子碰撞的完整过程，从最初的硬散射和弦形成，到动态去约束相过渡到夸克-胶子等离子体（QGP）以及强子化，再到随后的相互作用。强子相。在PHSD中，通过动态准粒子模型（DQPM）描述了部分子-匹配以重现晶格QCD导致热力学平衡-我们特别是通过反应qq̅→γ*，qq̅→γ* +来计算部分相互作用中的双核辐射g和qg→γ* q（q̅g→γ*q̅）在相对论重离子碰撞的早期。通过将我们的结果与PHENIX合作的数据进行比较，我们研究了不同dilepton产生机制的相对重要性，并指出了相空间中占主导地位的相空间区域。此外，在STAR检测器系统认可的范围内，给出了对双轻子的明确预测，并与初步数据进行了比较。

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  • 来源
    《Physical Review C: Nuclear Physics》 |2012年第2期|1-10|共10页
  • 作者

    O. Linnyk and W. Cassing; J. Manninen and E. L. Bratkovskaya; C. M. Ko;

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    Institut für Theoretische Physik Universität Giessen D-35392 Giessen Germany;

    Institut für Theoretische Physik Johann Wolfgang Goethe University D-60438 Frankfurt am Main Germany and Frankfurt Institute for Advanced Studies D-60438 Frankfurt am Main Germany;

    Cyclotron Institute and Department of Physics and Astronomy Texas AM University College Station Texas 77843-3366 USA;

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