论文标题
相对论重离子碰撞中的开放式魅力和障碍
Open charm and dileptons from relativistic heavy-ion collisions
论文作者
论文摘要
我们研究了相关的$ d \ d $ d $ PAIRS的半副作用衰变的开放式魅力产生的动力学和夸克 - 胶状等离子体（QGP）辐射（QGP）辐射的动力学和辐射的动力学。我们的研究基于Parton-Hadron-string Dynamics（PHSD）传输方法，采用了在动力学准粒子和基于Lattice QCD的EOS方面，采用了强烈相互作用的Quark-Gluon等离子体（SQGP）的非扰动QCD描述。我们将魅力可观察物的PHSD结果与BAMP的计算（Boltzmann方法的多果散射方法）进行了比较，该计算基于具有无质量parton的扰动QCD和以QCD耦合的领先顺序计算的相互作用横截面。我们比较了$ r_ {aa} $ $ d $ -meson的$ p_t $依赖性，$ d $ a+a $ a $ a $ to $ p+p+p $碰撞按二进制碰撞数量$ n_ {bin} $以及椭圆流$ v_2 $ $ d $ d $ d $ -MMESSONS缩放为phsd and phsd and bymsd and lhc-flogs and lhc colgs and lhc-d $ d $ d $ d。在其他研究中，基于PHSD计算，我们发现与中等质量的QGP相关的$ d- $ d- $ d- $ d- $ d- $ meson semi-leptonic衰减占据了QGP的“热”辐射，在中等PB+pb碰撞中，在中等质量（$ 1.2 <m <3 $ gev）（$ 1.2 <m <m <m <m <3 $ gev），但对于不可投射的能量，对于不可投射的能量} $} $} $ $ sqrt， GEV QGP辐射掩盖了$ d，{\ bar d} $衰减的贡献，使得人们应该从党的Dilepton辐射中观察到相当清晰的信号。这一发现提供了有希望的观点，可以在Rhic BES的DILEPTON实验和未来的Fair/NICA设施中测量QGP辐射。
We study the dynamics of open charm production and the dilepton radiation of the semi-leptonic decays of correlated $D\bar D$ pairs versus the quark-gluon plasma (QGP) radiation and hadronic sources in relativistic heavy-ion collisions. Our study is based on the Parton-Hadron-String Dynamics (PHSD) transport approach employing a non-perturbative QCD description of the strongly interacting quark-gluon plasma (sQGP) in terms of dynamical quasiparticles and the EoS based on lattice QCD. We compare the PHSD results for charm observables with the calculations from BAMPS (Boltzmann Approach to Multi-Parton Scatterings) which is based on perturbative QCD with massless partons and interaction cross sections calculated in leading order of the QCD coupling. We compare the $p_T$ dependence of the ratio $R_{AA}$ of $D$-mesons in $A+A$ over $p+p$ collisions scaled by the number of binary collisions $N_{bin}$ as well as the elliptic flow $v_2$ of $D$-mesons calculated within the PHSD and BAMPS at LHC energies. In other study, based on the PHSD calculations we find that the dileptons from correlated $D-$meson semi-leptonic decays dominate the 'thermal' radiation from the QGP in central Pb+Pb collisions at the intermediate masses ($1.2 < M < 3$ GeV) for higher invariant energies However, for invariant energies $\sqrt{s_{NN}} < 40$ GeV the QGP radiation overshines the contribution from $D,{\bar D}$ decays such that one should observe a rather clear signal from the partonic dilepton radiation. This finding provides promising perspectives to measure the QGP radiation in the dilepton experiments at RHIC BES and the future FAIR/NICA facilities.
