U.S.-Polish Collaborative Research: Production Mechanism andInternal Structive Studies of Exotic Mesons

美波合作研究：奇异介子的产生机制和内部结构研究

• 批准号: 9514904
• 负责人: Cheung-Ryong Ji
• 金额: $ 1.49万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-02-01 至 1999-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9514904&HistoricalAwards=false
• 关键词: U.S.; Polish; Collaborative; Research; Production

9514904 Ji This U.S.-Polish Cooperative Research award is to study "Production Mechanism and Internal Structive Studies of Exotic Mesons" The principal researchers for the American side are Dr. Chueng-Ryong Ji, Dr. Adam Szczepaniak, Dr. Stephen R. Cotanch, and Dr. Eric S. Swanson, all of North Carolina State University. The principal researcher for the Polish side is Dr. Leonard Lesniak of the Institute of Nuclear Physics in Krakow. The recent advent of CEBAF will help researchers obtain more accurate information on production mechanisms and the internal structure of mesons. The planned experiment on p(e,e'f0)p at CEBAF especially will shed light on present speculations about the exotic internal structure of scalar mesons. Through this award, the researchers will discuss two projects for the theoretical investigation of the production mechanism and the internal structure of mesons: (1) electroproduction and photoproduction of scalar mesons; (2) improved constituent quark model. The first project will merge the expertise of the Krakow group on the coupled channel model of scalar meson production mechanism with the program at North Carolina State University on the meson photo- and electro-production analyses. They will investigate the production mechanisms of f0,a0 and mesons using the channel coupling formalism of and KK developed by the Krakow group. In the second project, they propose to improve the existing constituent quark models of the ordinary mesons by including some of important QCD effects, in particular chiral symmetry breaking and nonvalence degrees of freedom. The aim of this project is to construct a constituent quark model which can describe both the ordinary mesons and the suspected exotic mesons such as scalar mesons, glueballs and hybrid mesons. However, at the minimum, the researchers propose to build the model that would lead to a spontaneous symmetry breaking and dynamically generated quark and gluon masses and calculate the s pectra of mesons including some of the suspected exotic mesons. This research in physics fulfills the program objectives of bringing together leading experts in the U.S. and Poland to combine complementary efforts and capabilities in areas of strong mutual interest and competence on the basis of equality, reciprocity, and mutuality of benefit. ***

小行星9514904 这个美国-波兰合作研究奖是对“奇异介子的产生机制和内部结构研究”的研究美方主要研究人员是Chueng-Ryong Ji博士、Adam Szczepaniak博士、Stephen R. Cotench和Eric S.斯旺森，所有的北卡罗来纳州州立大学。 波兰方面的首席研究员是克拉科夫核物理研究所的伦纳德莱斯尼亚克博士。 最近CEBAF的出现将有助于研究人员获得关于介子产生机制和内部结构的更准确信息。 计划在CEBAF进行的p（e，e 'f0）p实验尤其将阐明目前对标量介子奇异内部结构的猜测。 通过该奖项，研究人员将讨论两个对介子产生机制和内部结构进行理论研究的项目：（1）标量介子的电生和光生;（2）改进的组分夸克模型。 第一个项目将把克拉科夫小组关于标量介子产生机制的耦合通道模型的专门知识与北卡罗来纳州州立大学关于介子光生和电生分析的方案结合起来。 他们将研究f0，a0和 介子使用的通道耦合形式主义 和克拉科夫集团开发的KK。 在第二个项目中，他们建议通过引入一些重要的QCD效应，特别是手征对称性破缺和非价自由度，来改进现有的普通介子的组分夸克模型。 本项目的目标是建立一个既能描述普通介子又能描述奇异介子如标量介子、胶球和混合介子的组分夸克模型。 然而，至少，研究人员建议建立一个模型，导致自发对称性破缺和动态生成的夸克和胶子质量，并计算介子的s谱，包括一些可疑的奇异介子。 这项物理学研究实现了汇集美国和波兰领先专家的计划目标，在平等，互惠和互利的基础上，在强烈的共同利益和能力领域联合收割机互补努力和能力。 ***