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首页> 外文期刊>Physical Review C >Single electrons from heavy-flavor mesons in relativistic heavy-ion collisions
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Single electrons from heavy-flavor mesons in relativistic heavy-ion collisions

机译：来自重味型材的单一电子以相对论的重离子碰撞

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摘要

We study the single electron spectra from D- and B-meson semileptonic decays in Au + Au collisions at (s_(NN)~(1/2) = 200, 62.4, and 19.2 GeV by employing the parton-hadron-string dynamics (PHSD) transport approach that has been shown to reasonably describe the charm dynamics at Relativistic Heavy Ion Collider and Large Hadron Collider energies on a microscopic level. In this approach the initial charm and bottom quarks are produced by using the PYTHIA event generator which is tuned to reproduce the fixed- order next-to-leading logarithm calculations for charm and bottom production. The produced charm and bottom quarks interact with off-shell (massive) partons in the quark-gluon plasma with scattering cross sections which are calculated in the dynamical quasiparticle model that is matched to reproduce the equation of state of the partonic system above the deconfinement temperature Tc. At energy densities close to the critical energy density (≈0.5 GeV/fm~3) the charm and bottom quarks are hadronized intoD and B mesons through either coalescence or fragmentation. After hadronization the D and B mesons interact with the light hadrons by employing the scattering cross sections from an effective Lagrangian. The final D and B mesons then produce single electrons through semileptonic decay. We find that the PHSD approach well describes the nuclear modification factor RAA and elliptic flow v2 of single electrons in d + Au and Au + Au collisions at (s_(NN)~(1/2)= 200 GeV and the elliptic flow in Au + Au reactions at (s_(NN)~(1/2) = 62.4 GeV from the PHENIX Collaboration, however, the large R_(AA) at (s_(NN)~(1/2) = 62.4 GeV is not described at all. Furthermore, we make predictions for the RAA of D mesons and of single electrons at the lower energy of (s_(NN)~(1/2) = 19.2 GeV. Additionally, the medium modification of the azimuthal angle Φ between a heavy quark and a heavy antiquark is studied. We find that the transverse flow enhances the azimuthal angular distributions close to Φ = 0 because the heavy flavors strongly interact with nuclear medium in relativistic heavy-ion collisions and almost flow with the bulk matter.
机译：通过使用Parton-Hodron-String Dynamics（S_（NN）〜（1/2）= 200,62.4和19.2 GEV，从D-和B-MESON半单簧管衰减中研究单个电子谱系PHSD）运输方法已被证明可以合理地描述相对论的重离子撞机和微观级别的大强子撞机能量的魅力动态。在这种方法中，通过使用调谐的Pythia事件发生器来生产初始魅力和底部夸线再现用于魅力和底部生产的固定秩序的下一端对数计算。所产生的魅力和底夸克与夸克 - 胶质等离子体中的异壳（大规模）Partons相互作用，其散射横截面在动态Quasiparticle中计算匹配的模型以再现解构温度Tc上方的统一系统状态的等式。在靠近临界能量密度的能量密度（≈0.5gev / fm〜3）的能量密度下夸克是通过聚结或碎裂的脱位的Intod和B助词。在起消旋化之后，D和B斡旋通过采用来自有效拉格朗日的散射横截面与光重标。然后，最终的D和B介子通过半透明衰减产生单一电子。我们发现PHSD方法很好地描述了（S_（nn）〜（1/2）= 200 gev和au的椭圆流和au + au碰撞中单个电子的核修改因子Raa和椭圆流V2然而，来自Phenix协作的（S_（NN）〜（1/2）= 62.4 GEV的Au反应，但是，没有描述大的R_（AA）AT（S_（NN）〜（1/2）= 62.4 GEV所有。此外，我们在（S_（nn）〜（1/2）= 19.2 gev的较低能量下对D胶片的Raa和单电子进行预测。另外，沉重的方位角φ的介质修改研究了夸克和沉重的抗古绿币。我们发现横向流量增强了靠近φ= 0的方位角分布，因为重量味道与相对论的重离子碰撞中的核介质相互作用，并且几乎与散装物流动。

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  • 来源
    《Physical Review C》 |2017年第2017期|014905.1-014905.18|共18页
  • 作者

    Taesoo Song; Hamza Berrehrah; Juan M. Torres-Rincon; Laura Tolos; Daniel Cabrera; Wolfgang Cassing; Elena Bratkovskaya;

  • 作者单位

    Institute for Theoretical Physics Johann Wolfgang Goethe Universitaet Frankfurt am Main Germany Frankfurt Institute for Advanced Studies Johann Wolfgang Goethe Universitaet Frankfurt am Main Germany Institut fuer Theoretische Physik Universitaet Giessen Giessen Germany;

    Institute for Theoretical Physics Johann Wolfgang Goethe Universitaet Frankfurt am Main Germany Frankfurt Institute for Advanced Studies Johann Wolfgang Goethe Universitaet Frankfurt am Main Germany;

    Frankfurt Institute for Advanced Studies Johann Wolfgang Goethe Universitaet Frankfurt am Main Germany;

    Frankfurt Institute for Advanced Studies Johann Wolfgang Goethe Universitaet Frankfurt am Main Germany Institut de Ciencies de l’Espai (IEEC/CSIC) Campus Universitat Autonoma de Barcelona Carrer de Can Magrans s E-08193 Bellaterra Spain;

    Instituto de Fisica Corpuscular (IFIC) Centro Mixto Universidad de Valencia - CSIC Institutos de Investigacion de Paterna Apartado Correos 22085 E- 46071 Valencia Spain;

    Institut fuer Theoretische Physik Universitaet Giessen Giessen Germany;

    Institute for Theoretical Physics Johann Wolfgang Goethe Universitaet Frankfurt am Main Germany GSI Helmholtzzentrum fuer Schwerionenforschung GmbH Darmstadt Germany;

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