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: 0244668
• 负责人: Eric Swanson
• 金额: $ 3万
• 依托单位: University of Pittsburgh
• 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 2006-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0244668&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.

我们提出了一个重夸克强子截面的计算程序，这对于识别重离子碰撞中的夸克胶子等离子体（QGP）非常重要。该程序将涉及各种强子的反应截面的计算，这些强子已被提议作为QGP诊断探针，例如重夸克尼亚、超超子和反超子。大多数这些横截面目前无法通过实验获得，因此只能使用理论模型进行估计。该提案的核心部分包括使用完善的成分交换模型计算这些横截面，假设标准夸克模型力和我们两个人（巴恩斯和斯旺森）先前开发的散射形式主义。众所周知，这种方法与各种类似强子-强子散射过程的现有实验低能散射数据具有合理的一致性。将讨论的其他研究主题包括多通道和相对论体系方法的推广、QQ 对产生幅度的结合、微观和有效拉格朗日描述的比较，以及允许直接应用于束缚态问题的 T 矩阵形式主义的发展。这里获得的横截面应该有助于估计夸克-胶子等离子体的拟议实验信号的各种强子贡献。在通过各种特征确定 QGP 形成之前，必须理解这些强子贡献并将其纳入重离子碰撞模拟中；因此，我们计划的第三个组成部分是与参与 RHIC 实验蒙特卡罗模拟的研究人员密切合作，以便评估这些强子贡献对 RHIC 的实验影响。 ORNL 和田纳西大学的 PHENIX 大型 RHIC 实验小组的存在将促进这一点。