Collaborative Research: Heavy-Quark Reaction Cross Sections at RHIC: Studies of Quark-Gluon Plasma Signatures

合作研究：RHIC 的重夸克反应截面：夸克-胶子等离子体特征的研究

• 批准号: 0244786
• 负责人: Ted Barnes
• 金额: $ 12.2万
• 依托单位: University of Tennessee Knoxville
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2006-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0244786&HistoricalAwards=false
• 关键词: Collaborative; Research; Heavy; Quark; Reaction

We propose a program of calculations of heavy-quark hadron cross sections which areof great importance in the identifcation of a quark gluon plasma (QGP) in heavy-ion colli-sions. This program will involve the calculation of reaction cross sections of various hadronswhich have been proposed as QGP diagnostic probes, such as heavy quarkonia, hyper-ons, and antihyperons. Most of these cross sections are not accessible experimentally atpresent, and as such can only be estimated using theoretical models. The central compo-nent of this proposal consists of calculations of these cross sections using the well-establishedconstituent-interchange model, assuming standard quark model forces and a scattering for-malism developed previously by two of us (Barnes and Swanson). This approach is known togive reasonable agreement with existing experimental low-energy scattering data for a widerange of analogous hadron-hadron scattering processes. Additional research topics whichwill be addressed are the generalization of the approach to multichannel and relativisticregimes, the incorporation of qq pair production amplitudes, a comparison of microscopicand effective Lagrangian descriptions, and the development of a T-matrix formalism that willallow direct application to bound state problems. The cross sections obtained here shouldbe useful as estimates of the various hadronic contributions to the proposed experimentalsignals for the quark-gluon plasma. These hadronic contributions must be understood andincorporated in simulations of heavy-ion collisions before QGP formation can be establishedthrough various signatures; for this reason a third component of our program is a closecollaboration with researchers involved in Monte-Carlo simulations of RHIC experiments,so that the experimental implications of these hadronic contributions for RHIC can be as-sesssed. This will be facilitated by the presence of a large RHIC experimental group fromPHENIX at ORNL and University of Tennessee.

我们提出了一项重重夸克强调横截面的计算程序，该计划非常重要地在重型离子colli-sions中识别Quark Gluon等离子体（QGP）。该程序将涉及将已提议为QGP诊断探针（例如重Quarkonia，Hyper-Ons和Antihyperons）的各种Hadrons的反应横截面的计算。这些横截面中的大多数在实验上无法访问，因此只能使用理论模型估算。该提案的主要组成部分是使用良好的结构性交流模型对这些横截面进行计算，假设我们两个人（Barnes和Swanson）先前开发了标准的夸克模型力和一个散射效力。已知这种方法与现有的实验性低能散射数据进行合理的一致性，以提供类似的强子 - 二体散射过程的定义。将要解决的其他研究主题是对多通道和相对论的方法的概括，QQ对生产幅度的结合，显微镜和有效的Lagrangian描述的比较以及T-Matrix形式主义的发展，可以将直接应用于结束状态问题。此处获得的横截面应该有用，作为对夸克 - 胶原等离子体所提出的实验值的各种望元贡献的估计值。在可以通过各种特征建立QGP形成之前，必须将这些耐药的贡献理解为重型离子碰撞的模拟中；因此，我们程序的第三个组成部分是对参与RHIC实验的蒙特卡洛模拟的研究人员的关闭定位，因此可以将这些耐药性贡献的实验含义得到评估。在ORNL和田纳西大学的一个大型RHIC实验组的存在中，这将促进这一点。