论文标题
精确测量EIC $ {}^3 $ HE光束偏振的可行性研究，其偏振原子气射流射流目标极化计在RHIC
Feasibility study for precisely measuring the EIC ${}^3$He beam polarization with the Polarized Atomic Hydrogen Gas Jet Target polarimeter at RHIC
论文作者
论文摘要
偏振原子氢气射流目标极化计（HJET）用于测量绝对质子束极化，$σ_p^\ text {syst}/p \！\！\ sillesim \！0.5 \％$ $，在相关的重型离子Collider处。在这里，我认为有可能使用HJET测量$ {}^3 \ text {he} $（$ h $）在Electron-Ion Collider（EIC）上进行梁极化。 $ h^\ uparrow {p} $和$ p^\ uparrow {h} $分析能力的主要贡献（$ p^\ uparrow {h} $）可以轻松地使用质量众所周知的质子和螺旋磁矩值来计算，但是应应用一些校正来实现所需的精度。发现由于吸收和$ {}^3 \ text {he} $分解而有效取消的校正有效地取消，并且可以从质子束测量值中得出HADRONIC SPIN-FLIP振幅的校正。结果，测得的$ {}^3 \ text {he} $ beam偏振的预期系统不确定性可以满足eic要求$σ_p^\ text {syst}/p \！\！\ sillesim \！1 \％$。
The Polarized Atomic Hydrogen Gas Jet Target polarimeter (HJET) is used to measure the absolute proton beam polarization, $σ_P^\text{syst}/P\!\lesssim\!0.5\%$, at the Relativistic Heavy Ion Collider. Here I consider the possibility of employing HJET to measure the ${}^3\text{He}$ ($h$) beam polarization at the Electron-Ion Collider (EIC). The dominant contribution to the ratio of the $h^\uparrow{p}$ and $p^\uparrow{h}$ analyzing powers, which is needed for such measurements, can be easily calculated using well-known values of the proton and helion magnetic moments, but some corrections should be applied to achieve the required accuracy. It was found that corrections due to absorption and ${}^3\text{He}$ breakup effectively cancel in the ratio and a correction due to hadronic spin-flip amplitudes can be derived from the proton beam measurements. As a result, the anticipated systematic uncertainty in the measured ${}^3\text{He}$ beam polarization can satisfy the EIC requirement $σ_P^\text{syst}/P\!\lesssim\!1\%$.
