RUI: Studies of Hadron Structure and Interactions

拟议的研究将研究理论核物理中与强子结构及其相互作用有关的基本问题。它将集中在当代理论和实验兴趣的三个领域：强子中的部分子分布，反质子-质子相互作用中的奇异性产生，以及奇异势的重整化。强子中的部分子分布将使用介子云模型来计算，以包括强子自由度，并辅之以包括夸克和胶子过程的统计模型。该项目将解决最近的实验对理论提出的突出挑战之一，即在费米实验室的E866测量的大x值下质子中ubar超过dbar夸克的过量。对pbar-p反应中的奇异产生进行了高精度的计算。这些计算将通过最近发表的在CERN的PS185的自旋转移测量进行检验，这些测量与所有的理论预测都不一致。奇异势的正则化和极限环行为将被研究。先前的工作将扩展到更高的能量和更高的分波。这项工作与有效场论有关，并在广泛的物理学中应用，从Efimov状态到冷原子散射。该项目的更广泛影响来自于其在本科院校的研究和教育的整合，该大学拥有多样化的学生群体。学生研究助理将从一个主修物理的女生比例很高的系招聘。 该项目将提供校内研究经验，增加获得博士学位的途径。提供给目前在物理学界代表性不足的群体。研究课题已经选定，使他们能够访问本科生。学生将接受研究方法和科学交流方面的培训，并将在专业协会的会议上以论文，海报和讲座的形式展示他们的工作。 除了在期刊文章和科学会议上介绍研究成果外，P.I.将在其他本科院校举办研讨会和座谈会。

The proposed research will study fundamental questions in theoretical nuclear physics related to the structure of hadrons and their interactions. It will focus on three areas of contemporary theoretical and experimental interest: parton distributions in hadrons, strangeness production in antiproton-proton interactions, and the renormalization of singular potentials. Parton distributions in hadrons will be calculated using a meson cloud model to include hadronic degrees of freedom, supplemented by a statistical model which includes quark and gluon processes. This project will address one of the outstanding challenges to theory posed by recent experiment, the excess of ubar over dbar quarks in the proton for large values of x, measured by E866 at FermiLab. High precision calculations of strangeness production in pbar-p reactions will be made. These calculations will be tested by the recently published spin transfer measurements of PS185 at CERN, which disagree with all theoretical predictions. The regularization and limit cycle behavior of singular potentials will be studied. Prior work will be extended to higher energy and higher partial waves. This work is relevant for effective field theory and has applications in a broad spectrum of physics, from Efimov states to cold atom scattering.Broader impacts of the project derive from its integration of research and education in an undergraduate institution which has a diverse student population. Student research assistants will be recruited from a department which has a high percentage of women physics majors. The project will provide on-campus research experience that increases the number of pathways to the Ph.D. that are offered to groups currently underrepresented in the physics community. The research topics have been chosen so that they are accessible to undergraduates. Students will receive training in research methods and scientific communication and will present their work in papers, posters and talks at meetings of professional societies. In addition to the presentation of research findings in journal articles and at scientific meetings, the P.I. will give seminars and colloquia at other undergraduate institutions.