STAR的横旋研究现状
Current Status of Transverse Spin at STAR
摘要：
质子自旋的起源仍然是一个活跃的研究领域。布鲁克海文国家实验室的相对论重离子对撞机（RHIC）提供了独特的高质心能量极化质子数据。STAR先前已经报道了在200 GeV的s的平方根下，在正向方向上产生的包含性中性π介子的大横向单自旋不对称性，用称为“正向π介子探测器”（FPD）的模块化铅玻璃量热计测量。从2008年开始（运行8），STAR的前向量热法随着“前向介子谱仪”（FMS）的投入使用而得到显著增强，该谱仪在伪快度范围2.5至4.2内具有全方位覆盖。该探测器将不对称测量扩展到更高的横向动量，其大面积覆盖范围可以测量更高的质量共振和“射流”相关性。STAR还提供了出色的跟踪和全方位电磁量能计在中等快度的覆盖范围，这有利于分析自旋相关的喷流结构。在这里，我们回顾了最近的横向自旋测量与星探测器，也提出了一些现有的分析更新。
英文摘要：
The origins of the proton spin remain an area of active investigation. The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Lab uniquely provides polarized proton data at high center of mass energies. STAR has previously reported large transverse single spin asymmetries for inclusive neutral pion production in the forward direction at square root of s of 200 GeV, measured with a modular Pb-glass calorimeter called the "Forward Pion Detector" (FPD). Beginning in 2008 (Run 8), STAR's forward calorimetry was significantly enhanced with the commissioning of the "Forward Meson Spectrometer" (FMS), which has full azimuthal coverage in the pseudo-rapidity range 2.5 to 4.2. This detector has extended asymmetry measurements to higher transverse momentum, and its large areal coverage enables measurements of higher mass resonances and "jet-like" correlations. STAR also provides excellent tracking and full azimuthal electromagnetic calorimeter coverage at mid-rapidity, which facilitates analyses of spin-dependent jet structure. Here we review recent transverse spin measurements with the STAR detector and also present an update on some existing analyses.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
