The Hadron Spectrum using Lattice QCD Simulations with Extended Interpolating Operators

PHY-0510020 PI：Colin Morginstar Institution：Carnegie Mellon用扩展内插算符格子QCD模拟的强子能谱？这个方案的目的是用蒙特卡罗方法结合大量精心设计的算符计算轻夸克和重夸克常规和混合介子和重子的质量谱，如无激发、双魅力重子和五夸克态。这样的计算当然是具有挑战性的：将需要确定大的关联矩阵，必须通过匹配晶格对称群的不同不可约表示的简并模式来仔细地识别强子的自旋，在蒙特卡罗更新中包括夸克回路是至关重要的，将需要仔细研究有限体积和离散化效应，并且纳入多强子算符对于提取更高级别的共振将是重要的。然而，强大的变分技术的使用，以及美国能源部通过先进计算的科学发现计划前所未有的计算硬件和软件的可用性，使这种计算第一次成为可能。这些研究对于扩展我们对物质世界最基本的基础和我们宇宙起源的理解是很重要的。算法思想可能在其他计算领域也有应用。这项活动将促进受过计算技能培训的青年科学家的发展。将通过在受欢迎的出版物上发表文章和在公众可查阅的网页上张贴带有简化背景信息的结果来进行外联。

Abstract for PHY-0510020 PI: Colin Morginstar Institution: Carnegie Mellon The hadron spectrum using lattice QCD simulations with extended interpolating operators? The objective of this proposal is to calculate the mass spectrum of light- and heavy-quark conventional and hybrid mesons and baryons, such as the NO excitations, doubly-charmed baryons, and pentaquark states using Monte Carlo methods with large sets of well-designed operators. Such calculations are certainly challenging: determinations of large correlation matrices will be required, the identification of the spin of the hadrons must be carefully done by matching patterns of degeneracies across different irreducible representations of the symmetry group of the lattice, the inclusion of quark loops in the Monte Carlo updating is crucial, careful studies of finite-volume and discretization effects will be needed, and the incorporation of multihadron operators will be important for extracting the higher-lying resonances. However, the use of powerful variational techniques and the availability of unprecedented computing hardware and software through the DOE's Scientific Discoveries through Advanced Computing initiative, makes such calculations possible for the first time. These studies are important for extending our understanding of the most fundamental basis of our physical world and of the origins of our Universe. Algorithmic ideas are likely to have applications in other computational fields. This activity will promote the development of young scientists trained in computational skills. Outreach will be accomplished through articles in popular publications and by posting results with simplified background information on publicly accessible web pages.