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arXiv 1408.2964hep-phnucl-th
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超相对论重离子碰撞中重夸克的弹性和辐射相互作用

Elastic and radiative heavy quark interactions in ultra-relativistic heavy-ion collisions

Jan Uphoff, Oliver Fochler, Zhe Xu, Carsten Greiner

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18 pages, 18 figures
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摘要：

本文用部分子输运描述BAMPS（Boltzmann Approach to MultiParton Scatterings）研究了重夸克与轻部分子的弹性和辐射相互作用。在改进的Gunion-Bertsch近似下计算了有限质量辐射过程的截面，并通过与精确结果的比较验证了计算结果的正确性。此外，我们还利用BAMPS方法计算了BNL相对论重离子对撞机（RHIC）和CERN大型强子对撞机（LHC）上超相对论重离子碰撞中胶子、轻夸克和重夸克的3+ 1维时空演化，包括弹性和辐射重味相互作用.将轻粒子和重粒子放在同一个框架下处理，我们发现在LHC上实验测得的带电强子和D介子的核修正因子可以同时描述。此外，我们计算了重味演变与改进的屏蔽程序从硬热回路计算和面对的核修改因子和重味粒子在RHIC和LHC的椭圆流的实验数据的结果。

英文摘要：

Elastic and radiative heavy quark interactions with light partons are studied with the partonic transport description BAMPS (Boltzmann Approach to MultiParton Scatterings). After calculating the cross section of radiative processes for finite masses in the improved Gunion-Bertsch approximation and verifying this calculation by comparing to the exact result, we study elastic and radiative heavy quark energy loss in a static medium of quarks and gluons. Furthermore, the full 3+1D space-time evolution of gluons, light quarks, and heavy quarks in ultra-relativistic heavy-ion collisions at the BNL Relativistic Heavy-Ion Collider (RHIC) and the CERN Large Hadron Collider (LHC) are calculated with BAMPS including elastic and radiative heavy flavor interactions. Treating light and heavy particles on the same footing in the same framework, we find that the experimentally measured nuclear modification factor of charged hadrons and D mesons at the LHC can be simultaneously described. In addition, we calculate the heavy flavor evolution with an improved screening procedure from hard-thermal-loop calculations and confront the results with experimental data of the nuclear modification factor and the elliptic flow of heavy flavor particles at RHIC and LHC.

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