Measurement of Nucleon Spin Structure at RHIC

这笔赠款支持宾夕法尼亚州立大学参与布鲁克海文的STAR实验，包括布鲁克海文实验室的全职研究员小川Akio。宾夕法尼亚州立大学研究小组的主要兴趣是利用RHIC的极化质子束实验研究质子自旋结构。被批准的用于这一物理的恒星探测器的升级包括一个EMC(电磁量热计)。随着该系统的上线，STAR将能够重建极化结构函数测量所需的更高速率、更高横向动量相互作用。利用这些新特征对质子自旋结构进行有意义的测量是一个非常大的软件挑战。宾夕法尼亚州立大学正在开发模拟、收集和分析来自STAR的这些数据所需的软件。预计在接下来的几年里，在RHIC运行的一些极化质子将成为STAR计划中日益重要的组成部分。这些实验的中心目标将是测量胶子场对质子自旋的贡献。

This grant supports the participation of the Penn State University inthe STAR experiment at Brookhaven, including a full time researchassociate, Akio Ogawa, at Brookhaven Lab. The principal interest of thePenn State group involves the study of proton spin structure withexperiments using polarized proton beams at RHIC. The approved upgradesto the STAR detector for this physics include an EMC (Electro-MagneticCalorimeter). As this system comes online, STAR will be capable ofreconstructing the higher rate, higher transverse momentum interactionsthat are needed for polarized structure function measurements. Theutilization of these new features for a meaningful measurement of protonspin structure presents a very large software challenge. Penn State isdeveloping software that will be required to simulate, collect andanalyzed these data from STAR. Some polarized proton running at RHIC isexpected each year for the next several years and will likely be inincreasingly important component of the STAR program. The centralobjective of these experiments will be the measurement of thecontribution of gluon fields to the proton spin.