Lattice QCD on Blue Waters

该提案涉及将于2011年投入运行的蓝色沃茨计算机系统的临时时间分配，以及支持与蓝色沃茨项目小组进行技术协调的差旅费，该项目将利用蓝色沃茨进行量子色动力学的数值实验。 模拟将用于确定核物理标准模型的基本参数，并将有助于确定其有效性范围。 它们还将用于计算强相互作用粒子的质量、内部结构和相互作用，包括上夸克和下夸克的质量以及夸克之间弱跃迁耦合的值。这些是定义标准模型的拉格朗日函数中的参数，对这些参数的细化将允许在标准模型下预测罕见的衰变。 这种衰变的预测性质可以与高能物理实验中的衰变特征进行定量比较。 物理学家计划利用这种比较来确定标准模型的有效性范围。 像这样的格点规范计算与大型强子对撞机和相对论重离子对撞机等设施中的实验相结合，为探索亚原子粒子行为的新物理学提供了一种方法。 该模拟将把轻夸克和重夸克质量的不确定性降低到1%，并有助于解决核物理学中的许多其他问题。该项目将提供一个规范配置库，该库将作为一种资源提供给国内外许多核物理学家，以支持他们的研究。 预计这些配置将被用作许多博士论文和博士后研究项目的输入数据。

This proposal is for a provisional allocation of time on the Blue Waters computer system, due to become operational in 2011, and for travel funds to support technical coordination with the Blue Waters project team.The project will use Blue Waters to conduct numerical experiments in quantum chromodynamics. The simulations will be used to determine fundamental parameters of the Standard Model of nuclear physics and will help to determine its range of validity. They will also be used to calculate the masses, internal structure and interactions of strongly interacting particles, including the masses of the up and down quarks and the values of the weak transition couplings between quarks. These are parameters in the Lagrangian that defines the Standard Model and refinement of these parameters will allow the prediction of rare decays under the Standard Model. The nature of the predictions of such decays can be quantitatively compared with the signatures of such decays in high-energy physics experiments. Physicists plan to use such comparisons to determine the range of validity of the Standard Model. The combination of lattice-gauge calculations such as these and experiments in facilities such as the Large Hadron Collider and Relativistic Heavy Ion Collider offer a way of probing for new physics in the behavior of sub-atomic particles. The proposed simulations will reduce the uncertainty in the masses of the light and heavy quarks to 1% and contribute to a number of other questions in nuclear physics.The project will provide a library of gauge configurations that will be made available as a resource that will support research by many nuclear physicists, domestically and internationally. It is anticipated that these configurations will be used as input data for many doctoral theses and post-doctoral research projects.