论文标题
关于测量$ {}^3 \ rm {he} $ beam在eic by hjet polarimeter的可能性
On the possibility of measuring the polarization of a ${}^3\rm{He}$ beam at EIC by the HJET polarimeter
论文作者
论文摘要
对未来电子离子碰撞器（EIC）的强子极化法的要求包括对绝对螺旋的测量（$ {}^3 \ text {he} $，$ h $）束极化，系统不确定性比$σ^^\ text {syst} _p/p \ simes p \ simsim1 \％$ $更好。在这里，我们认为有可能利用偏振原子氢气射流目标（HJET）来精确测量$ \ sim $ \ sim $ 100 GEV/N Helion Beam的极化。 HJET可在相对论重离子对撞机上确定绝对质子束极化，它提供了约$δ^\ text {syst} p/p/p/p \ sim0.5 \％$的精度。适应HJET方法的EIC螺旋光束的潜在问题包括（i）需要知道$ p^\ uparrow {h} $和$ h^\ uparrow {p} $分析powers $ a_ \ a_ \ a_ \ text { $ {}^3 \ text {he} $分解，（iii）在10 ns束间距光束中操作。此处讨论的分析的初步结果表明，可以克服列出的问题，并且可以通过所需的精度来测量HJET的螺旋束绝对极化。
The requirements for hadron polarimetry at the future Electron Ion Collider (EIC) include measurements of the absolute helion (${}^3\text{He}$, $h$) beam polarization with systematic uncertainties better than $σ^\text{syst}_P/P\lesssim1\%$. Here, we consider a possibility to utilize the Polarized Atomic Hydrogen Gas Jet Target (HJET) for precision measurement of polarization of the $\sim$100 GeV/n helion beam. HJET, which serves to determine absolute proton beam polarization at the Relativistic Heavy Ion Collider, provides the accuracy of about $δ^\text{syst}P/P\sim0.5\%$. Potential problems for adapting the HJET method for the EIC helion beam include (i) necessity to know the ratio of $p^\uparrow{h}$ and $h^\uparrow{p}$ analyzing powers $A_\text{N}^{ph}(t)/A_\text{N}^{hp}(t)$ with high precision, ({ii) possible beam ${}^3\text{He}$ breakup, and (iii) operation in a 10 ns bunch spacing beam. Preliminary results of an analysis discussed here indicate that the listed problems can be overcome and the helion beam absolute polarization can be measured by HJET with the required accuracy.
