论文标题
$ {}^3 $ HE光束两极分化的分解校正将来BNL电子离子对撞机
Breakup corrections to the ${}^3$He beam polarization measurements at the future BNL Electron Ion Collider
论文作者
论文摘要
对未来电子离子对撞机（EIC）的强子极化法的要求包括对绝对$ {}^3 \ text {he}（h）$ beam偏振的测量值，其系统不确定性比$σ^\ text {syst} _p/p \ listsimsim1 \％$。由于成功使用，自2005年以来，偏振氢射流目标极化计（HJET）在相对论重离子对撞机（RHIC）处测量质子束极化，因此HJET技术有望适用于$ {}^3 \ text {He} $ pallerimetry在EIC处。但是，为此，人们需要知道$ h^\ uparrow {p} $和$ p^\ uparrow {h} $分析权力的比率。对于弹性散射，如果$ p^\ uparrow {p} $分析能力是精确的，则可以以足够的精度评估该比率。在本文中，由于$ {}^3 \ text {he} $ breakup，使用RHIC RUN 16中在HJET中获取的Deuteron Beam数据进行评估。如果梁和靶（JET）单个旋转不对称的比率同时测量以确定$ {}^3 \ text {he} $ beam极化，则发现分解效应可忽略不计。
Requirements for hadron polarimetry at the future Electron-Ion Collider (EIC) include measurements of absolute ${}^3\text{He} (h)$ beam polarization with systematic uncertainties better than $σ^\text{syst}_P/P\lesssim1\%$. Due to the successful use, since 2005, of the polarized hydrogen jet target polarimeter (HJET) to measure proton beam polarization at the Relativistic Heavy Ion Collider (RHIC), the HJET technique promises to be suitable for the ${}^3\text{He}$ polarimetry at EIC. For that, however, one needs to know the ratio of the $h^\uparrow{p}$ and $p^\uparrow{h}$ analyzing powers. For elastic scattering, this ratio can be evaluated with sufficient accuracy if $p^\uparrow{p}$ analyzing power is precisely known. In this paper, the deuteron beam data acquired at HJET in RHIC Run 16 was used to evaluate corrections to the measured helion beam polarization due to the ${}^3\text{He}$ breakup. The breakup effect was found to be negligible if the ratio of the beam and target (jet) single spin asymmetries are concurrently measured to determine the ${}^3\text{He}$ beam polarization.
