Research in High Energy Theoretical Physics

PI是MILC合作组织的主要成员，该合作组织使用格点规范理论的方法进行QCD的非微扰研究。他的计划的目标一般是计算介子的轻子和半轻子衰变中的强相互作用效应，通过确定有限温度和密度下QCD的行为来确定相对论重离子对撞机产生的夸克胶子等离子体的平衡性质，预测可以在实验中研究和观察的QCD中的新激发态，最后，测试和改进MILC合作组使用的计算方法，然后将使用新算法的模拟与轻强子性质的数据进行比较。 一个重要的焦点将是研究重-轻介子的半轻子和轻子衰变。这些量在当前的实验中直接测量，因此可以立即与晶格计算进行比较。他打算确定手征微扰理论的低能常数。一旦这些常数以足够的精度计算出来，它们就可以反过来用来计算物理量，这些物理量本身不能直接用于晶格计算。 另一个将被研究的主题将是QCD热力学，当奇怪的夸克被添加到以前的研究中时。这个研究项目将导致深入了解强相互作用理论在非微扰区域的行为。这是特别重要的解释实验中，这方面的知识是至关重要的，如在理解弱衰变的强相互作用粒子，并在夸克胶子等离子体。 通过培训学生在格QCD PI给学生在计算科学，使他们能够在需要这种培训的其他领域出类拔萃优秀的培训。 PI开发的点阵配置以及算法可供整个社区使用。

The PI is a leading member of the MILC collaboration which performs nonperturbative studes of QCD using the methods of lattice gauge theory. The goals of his program in general are to calculate strong-interaction effects in the leptonic and semileptonic decays of mesons, determining the equilibrium properties of the quark-gluon plasma produced at the Relativistic Heavy Ion Collider by determining the behavior of QCD at finite temperature and density, predicting new excited states in QCD that can be studied and observed in experiments, and finally to test and improve the computational methodology used by the MILC collaboration and then compare simulationsusing new algorithms with data on the properties on the light hadrons. An important focus will be to study the Semileptonic and leptonic decays of heavy-light mesons. These quantities are directly measured in current experiments and can therefore immediately be compared to the lattice calculations. He intends to determine the low energy constants of Chiral Perturbation Theory. Once these constants are computed with a sufficient precision, they can in turn be used to compute physical quantities that are itself not directly accessible to lattice calculations. Another topic that will be investigated will be QCD thermodynamics when strange quarks are added to previous investigations. This research project will lead to insight into how the theory of Strong Interactions behaves in non-perturbative regions. This is especially important in the interpretation of experiments where this knowledge is crucial such as in understanding the weak decays of strongly interacting particles, and in the quark gluon plasma. By training students in Lattice QCD the PI has given students excellent training in Computational Science which has allowed them to excel in other fields which require this training. The lattice configurations as well as the algorithms developed by the PI are made available to the community at large.