Heavy Quarkonia as Thermometer of Quark-Gluon Plasma

重夸克尼亚作为夸克-胶子等离子体温度计

基本信息

批准号：
1812332
负责人：
Alexei Bazavov
金额：
$ 24万
依托单位：
Michigan State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-08-15 至 2023-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1812332&HistoricalAwards=false
关键词：
Heavy Quarkonia Thermometer Quark Gluon

项目摘要

The strong force is one of the fundamental forces in nature, described by a quantum field theory called Quantum Chromodynamics (QCD). This force is responsible for binding elementary particles, called quarks, into protons and neutrons, and the latter into atomic nuclei. Under normal conditions in our everyday world quarks are always bound into composite objects and isolated quarks are never observed. However, when strongly interacting matter is heated to extreme temperatures (a million times the temperature in the core of the sun and above) a novel phase of matter, called a Quark-Gluon Plasma (QGP), appears where composite objects melt and quarks become the deconfined fundamental degrees of freedom. The PI will perform a first-principle study of how composite states of heavy quarks, referred to as heavy quarkonia, behave in a QGP. Theoretical knowledge of their properties and melting patterns provides information about QGP and allows us to study the microscopy of QGP, the nature of quark confinement and the strong force in general. The investigations in this project are of great relevance for explaining the findings of the experimental program of relativistic heavy-ion collisions, performed at the Relativistic Heavy-Ion Collider at Brookhaven National Laboratory and the Large Hadron Collider at the European Organization for Nuclear Research.This project seeks to carry out first-principle, parameter-free predictions of heavy quarkonia spectral functions that encode all information about the quarkonia states, from the fundamental QCD Lagrangian. The PI will develop novel theoretical and computational methods for performing Monte Carlo lattice gauge theory computations with anisotropic Highly Improved Staggered Quarks (aHISQ) action. The heavy quarks will be included in the framework of Non-Relativistic QCD (NRQCD). The PI will also develop Bayesian inference techniques for solving the inverse problem that arises when reconstructing the spectral functions from the lattice QCD data. These new methods will be explored, tested with the available lattice data, and implemented in an open-source codebase. The main goal is to achieve predictive results on the spectral functions with fully assessed statistical and systematic uncertainties. The PI will mentor doctorate students involved in the research as well as engage in public outreach activities.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

强力是自然界中的基本力之一，用称为量子染色体动力学（QCD）的量子场理论描述。这种力是将称为夸克的结合基本颗粒变成质子和中子，后者将其变成原子核。在我们日常世界中的正常条件下，夸克总是被束缚在复合物体中，并且永远不会观察到孤立的夸克。但是，当将强烈相互作用的物质加热到极端温度（是太阳及以上的温度的一百万倍）时，一个新的物质阶段（称为夸克 - 胶状等离子体（QGP））就会出现，而复合物体熔体融化和夸克成为自由的基本自由度。 PI将对重型夸克的复合状态（称为重夸克尼亚）进行第一本研究。对其性质和熔融模式的理论知识提供了有关QGP的信息，并使我们能够研究QGP的显微镜，夸克限制的性质以及一般的强力。 The investigations in this project are of great relevance for explaining the findings of the experimental program of relativistic heavy-ion collisions, performed at the Relativistic Heavy-Ion Collider at Brookhaven National Laboratory and the Large Hadron Collider at the European Organization for Nuclear Research.This project seeks to carry out first-principle, parameter-free predictions of heavy quarkonia spectral functions that encode all information about the quarkonia states, from the fundamental QCD Lagrangian。 PI将开发新的理论和计算方法，用于使用各向异性高度改进的交错夸克（AHISQ）动作进行蒙特卡洛晶格量规计算。重型夸克将包括在非相关QCD（NRQCD）的框架中。 PI还将开发贝叶斯推理技术，以解决从晶状体QCD数据重建光谱函数时产生的反问题。这些新方法将被探索，使用可用晶格数据进行测试，并在开源代码库中实现。主要目标是通过完全评估的统计和系统的不确定性获得光谱函数的预测结果。 PI将指导参与研究的学生以及参与公共宣传活动。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响评估标准，被认为值得通过评估来获得支持。