LHC能区重味夸克和重味夸克偶素作为QCD物质探针的统一研究

With the on-going Run2 of the LHC, the research on Quark-Gluon Plasma (QGP) through relativistic heavy-ion collisions has come into a new phase; that is, we are aiming to quantify the transport properties of QGP from the point of view of fundamental QCD interactions in the high-temperature environment. In this enterprise that must engage close interactions between experiment and theory, heavy quarks (charm and beauty) and heavy quarkonia (charmonia and bottomonia) are expected to play a special role, as they constitute tagged (identified) sensitive probes from production through interactions in the medium till observation, thereby likely preserving the memory of their reinteraction history...In this proposal, as a substantial development of our previous work, we are going to build up a theoretical framework, that aims to describe both open (heavy quark) and hidden (heavy quarkonia) heavy flavor probes in a unified Langevin dynamical approach, based on the non-perturbative T-matrix interactions of heavy quarks with the medium. We further apply the framework to heavy-ion collisions at the LHC energies and calculate the heavy flavor observables in a wide range, in connection with but not limited to the planned ALICE upgrade. On the one hand, going beyond the previous single-channel model, we will explore the coupled-channel approach that incorporates charm quarks, light quarks, gluons as well as D mesons, and calculate the charm quark elastic and radiative energy loss in a self-consistent manner. The ensuing phenomenological consequences will be also investigated. On the other hand, by incorporating potential interactions between charm and anti-charm quarks in the Langevin diffusion equation, we will look into the intriguing implications of single heavy quark diffusion on the formation of heavy quarkonium. Here we aim to study the dissociation and regeneration (through charm and anti-charm quark recombination) of heavy quarkonium in QGP from the point of view of more microscopic interactions and disentangle different charmonium dissociation mechanisms (Debye screening, gluon dissociation and quasi-free/Landau damping).

随着LHC Run2的进行，通过相对论重离子碰撞实验对夸克-胶子等离子体(QGP)的研究已进入新的阶段：我们试图从高温环境中的QCD基本相互作用定量确定QGP的输运性质。重味夸克和重味夸克偶素提供了一个贴有“标签”的敏感探针，因而在这一实验和理论实践中具有特殊的地位。本项目中，我们将在先前工作的基础上，试图建立一个基于非微扰T-矩阵相互作用的，统一描述重味夸克和重味夸克偶素探针的郎之万动力学框架，并联系ALICE实验升级计划，模拟和计算LHC能区重离子碰撞实验中的相关可观测量。一方面，超出之前的单道弹性散射模型，我们将通过耦合道T-矩阵方法，自洽计算璨夸克的弹性碰撞和胶子辐射两种能量损失机制，并研究其唯像后果。另一方面，我们将通过在郎之万动力学中考虑璨和反璨夸克的相互作用，研究单个重味夸克输运对形成夸克偶素的影响，并由此超出宏观输运模型，从微观相互作用上计算重味夸克偶素的解体和重组合产生。

随着LHC Run2的进行，通过相对论重离子碰撞实验对夸克-胶子等离子体(QGP)的研究已进.入新的阶段：我们试图从高温环境中的QCD基本相互作用定量确定QGP的输运性质。重味夸克和.重味夸克偶素提供了一个贴有“标签”的敏感探针，因而在这一实验和理论实践中具有特殊的.地位。本项目中，我们将在先前工作的基础上，试图建立一个基于非微扰T-矩阵相互作用的，.统一描述重味夸克和重味夸克偶素探针的郎之万动力学框架，并联系ALICE实验升级计划，模.拟和计算LHC能区重离子碰撞实验中的相关可观测量。一方面，超出之前的单道弹性散射模型.，我们将通过耦合道T-矩阵方法，自洽计算璨夸克的弹性碰撞和胶子辐射两种能量损失机制，.并研究其唯像后果。另一方面，我们将通过在郎之万动力学中考虑璨和反璨夸克的相互作用，.研究单个重味夸克输运对形成夸克偶素的影响，并由此超出宏观输运模型，从微观相互作用上.计算重味夸克偶素的解体和重组合产生。

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