论文标题
通过在HERA和EIC上散射的极化散射来探测深色光子
Probing the dark photon via polarized DIS scattering at the HERA and EIC
论文作者
论文摘要
除标准模型以外的许多新物理学中，深色光子在许多新物理中得到了广泛的预测。在这项工作中，我们建议在HERA和即将到来的Electron-Ion Collider（EIC）中利用偏光Lepton横截面，以探测深色光子的性质。它表明，当黑暗光子质量$ m_ {a_d} <10〜 {\ rm gev} $带有偏振光光束时，我们可以限制混合参数$ε<0.02 $，并且该界限可与未极化HERA数据相当。借助EIC的高积分光度和高电子束极化，可以进一步改善$ε$的上限。根据横截面测量的系统误差的假设，我们在$ 300〜 {\ rm fb}^{ - 1} $的集成亮度下获得了$ε<0.01 \ sim 0.02 $ 0.02 $ 0.02 $。我们还讨论了横截面和单旋链不对称测量在探测深色光子中的互补作用。
The dark photon is widely predicted in many new physics beyond the Standard Model. In this work, we propose to utilize the polarized lepton cross section in neutral current DIS process at the HERA and upcoming Electron-Ion Collider (EIC) to probe the properties of the dark photon. It shows that we can constrain the mixing parameter $ε<0.02$ when the dark photon mass $m_{A_D}<10 ~{\rm GeV}$ at the HERA with polarized lepton beam and this bound is comparable to the limit from the unpolarized HERA data. With the help of high integrated luminosity and high electron beam polarization of the EIC, the upper limit of the $ε$ could be further improved. Depending on the assumption of the systematic error of the cross section measurements, we obtain $ε<0.01\sim 0.02$ for the mass region $m_{A_D}<10~{\rm GeV}$ under the integrated luminosity of $300~{\rm fb}^{-1}$. We also discuss the complementary roles between the cross section and the single-spin asymmetry measurements in probing the dark photon.
