标题： 电磁场对相对论重离子碰撞中重夸克定向和椭圆流生成的影响 显示英文标题

标题： The influence of electromagnetic fields on the generation of the directed and elliptic flows of heavy quark in relativistic heavy-ion collisions

摘要： 我们研究自生成的电磁场（EMF）在重离子碰撞中产生的部分子和强子介质中对魅夸克动量演化的影响，该研究是在RHIC能量下通过Parton-Hadron-String Dynamics（PHSD）非定态输运方法进行的。 在夸克-胶子等离子体（QGP）相中，魅夸克与非定态部分子相互作用，其质量和宽度由动态准粒子模型（DQPM）给出，该模型可以再现格点QCD热力学。 背景电磁场在PHSD中动态计算，考虑了靶核和参与核质子以及新产生的带电强子、夸克和反夸克，这自然反映了介质的电导率$\sigma_{el}$。 我们在电磁场存在的情况下研究$D$介子的定向流和椭圆流。 我们发现通过$D^0$和$\overline{D}^0$介子的$D$介子$v_1$的电磁诱导分裂与实验数据一致。 此外，我们注意到，在重夸克 $v_1$ 随 $p_T$ 的变化情况作为探测产生的电磁场的手段更为显著。 然而，我们发现电磁场对重夸克椭圆流 $v_2$ 的影响很小。 显示英文摘要

摘要： We study the impact of self-generated electromagnetic fields (EMF) on the charm quarks momentum evolution in the partonic and hadronic medium created in heavy-ion collisions at RHIC energy within the Parton-Hadron-String Dynamics (PHSD) off-shell transport approach. In the quark-gluon plasma (QGP) phase, the charm quark interacts with the off-shell partons whose mass and widths are given by the Dynamical Quasi-Particle Model (DQPM), which can reproduce the lattice QCD thermodynamics. The background electromagnetic fields are computed dynamically within the PHSD considering both the spectators and participants protons as well as newly produced charged hadrons, quarks, and antiquarks, which reflects naturally the electric conductivity $\sigma_{el}$ of the medium. We study the directed and elliptic flow of the $D$ mesons in the presence of the electromagnetic fields. We find that electromagnetically induced splitting in the $D$ meson $v_1$ through $D^0$ and $\overline{D}^0$ mesons is consistent with the experimental data. Furthermore, we notice that the splitting in the heavy quark $v_1$ as a function of $p_T$ is more prominent as a probe of the produced electromagnetic fields. However, we find only a small impact of electromagnetic fields on the heavy quark elliptic flow $v_2$.