Research in High Energy Theoretical Physics

PI是MILC合作的主要成员，该合作利用格点规范理论的方法进行QCD的非微扰研究。他的计划的总体目标是计算介子轻子和半轻子衰变中的强相互作用效应，通过确定QCD在有限温度和密度下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QCD中可以在实验中研究和观察到的新激发态，最后测试和改进MILC合作使用的计算方法，然后将使用新算法的模拟与关于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。这些量是在目前的实验中直接测量的，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量常数。一旦这些常量以足够的精度被计算出来，它们又可以被用来计算本身不能被晶格计算直接访问的物理量。另一个将被研究的话题将是QCD热力学，当奇怪的夸克被添加到之前的研究中时。这一研究项目将引导我们深入了解强相互作用理论在非微扰区的行为。这在解释实验中尤其重要，因为在实验中，这一知识是至关重要的，例如在理解强相互作用粒子的弱衰变以及夸克胶子等离子体中。通过对学生进行格子QCD培训，PI给了学生在计算科学方面的出色培训，这使他们能够在其他需要这种培训的领域出类拔萃。PI开发的晶格配置和算法可供广大社区使用。

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.