A Proposal to Investigate Parity Violating Electron Scattering and Hypernuclear Physics

* 9870278约翰斯顿路易斯安那理工大学粒子物理组的研究计划包括宇称违反电子散射反应的研究，超核物理研究，电弱相互作用，以及旨在包括来自多个学科的本科生，工程师，科学教师和高中生的教育推广计划。在TJNAF PAC批准的G 0实验中，在后向和前向电子散射角下进行一系列电子质子弹性宇称违反不对称性测量，由此可以分别确定核子奇异电和奇异磁形状因子。路易斯安那理工大学粒子物理组将通过测量N到Delta跃迁中的宇称违反不对称性，将宇称违反测量扩展到弹性通道之外，TJNAF E97-104。由于这种过渡的纯等矢量性质，这种共振的宇称违反不对称性只取决于标准模型参数，已知的电磁过渡形状因子和鲜为人知的轴向过渡形状因子的贡献。 这些测量提供了对这种形状因子的直接访问，并且代表了在弱相互作用的中性电流扇区中对该量的第一次测量。弹性和非弹性通道测量都需要建造两套探测器。该提案详细概述了该小组基于TJNAF的核物理和粒子物理计划，以及这些活动对路易斯安那理工大学的影响。 选定的项目范围符合该小组的规模和专门知识，并最大限度地利用了迄今为止所收到的所有现有设施和资金。 该提案的资助将使路易斯安那理工大学的粒子物理小组继续为物理研究做出重大贡献，并提高本科生和当地高中学生和教师的教育机会。

***9870278JohnstonThe research program of the Louisiana Tech University Particle Physics Group includes studies of parity violating electron scattering reactions, hypernuclear physics studies, electroweak interactions, and an educational outreach program designed to include undergraduate students from several disciplines, engineers, science teachers, and high school students in forefront physics research projects.In the TJNAF PAC approved G0 experiment, a series of electron proton elastic parity violating asymmetry measurements will be performed at both the backward and forward electron scattering angles, from which the nucleon strange electric and magnetic form factors can be determined separately. The Louisiana Tech Particle Physics Group will extend parity violation measurements beyond the elastic channel by including a measurement of the parity violating asymmetry in the N to Delta transition, TJNAF E97-104. Due to the pure isovector nature of this transition, the parity violating asymmetry for this resonance consists of contributions depending only on standard model parameters, known electromagnetic transition form factors, and the poorly known axial transition form factor. These measurements provide direct access to this form factor, and represent the first measurement of this quantity in the neutral current sector of the weak interaction. Building two sets of detectors is required for both the elastic and inelastic channel measurements.This proposal outlines the group's TJNAF based nuclear and particle physics program in detail, and the impact these activities have had at Louisiana Tech. The scope of the projects selected are consistent with the group's size and expertise, and have maximized all of the available facilities and funding thus far received. Funding of this proposal will allow the Particle Physics Group at Louisiana Tech to continue to make major contributions to physics research, and enhance the educational opportunities for undergraduate students and local high school students and teachers.***