RUI: Studies of Heavy Quarkonium Spectroscopy with the CLEO and CLEO-c Experiments

路德学院在康奈尔大学CESR实验室的CLEO-c实验中从事重夸克偶素的研究。 重夸克偶素系统--粲偶素（粲夸克和反夸克的束缚态系统）和底偶素（底夸克扇区中的类似系统）--通常被认为是量子色动力学（QCD）、强相互作用量子理论和格点QCD计算的重要试验场。 这个提议的中心目标之一是观察底偶素的最低单重态--夸克和反夸克自旋反向排列的状态。这些状态还没有被实验观察到，因此，没有关于bottomonium中重要的自旋-自旋相互作用的知识。在粲偶素中，已经观察到了低的单重态，但是它们的质量测量需要改进，以便为理论提供严格的测试。 所提出的测量具有超越强相互作用物理学和夸克偶素谱的直接背景的潜在影响，有助于为B工厂和其他地方正在进行的标准模型实验提供输入。把粒子物理学的研究工作，以路德学院这样的小型本科院校确实是罕见的，拟议的努力将有助于加强部门的研究组合，并提供更多的研究工作的机会，以本科生在显著数字。

Luther College is engaged in the study of heavy Quarkonia at the CLEO-c experiment at the Cornell CESR Laboratory. Heavy quarkonium systems - charmonium, the system of bound states of the charm quark and its antiquark, and bottomonium, the analogous system in the bottom quark sector - are generally regarded as an important testing ground for Quantum Chromodynamics (QCD), the quantum theory of strong interactions, and Lattice QCD calculations. One of the central aims of this proposal is to observe the lowest lying singlet states of bottomonium- those states in which the quark and antiquark spins are oppositely aligned. These states have not yet been observed experimentally, and as a result, there is no knowledge of the important spin-spin interaction in bottomonium. In charmonium, the low-lying singlet states have been observed, but their mass measurements need improvement in order to provide stringent tests for theory. The proposed measurements have a potential impact beyond the immediate context of strong-interaction physics and quarkonium spectra, by helping to provide input for tests of the Standard Model that are being pursued experimentally at the B-factories and elsewhere. To bring a particle physics research effort to a small undergraduate institution like Luther College is rare indeed, and the proposed effort will serve to strengthen the Departments research portfolio and make available more opportunities for research work to undergraduate students in significant numbers.