Probing the dark photon via polarized DIS scattering at the HERA and EIC

Abstract

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 $\epsilon <0.02$ when the dark photon mass $m_{A_D}<10\mathrm{GeV}$ 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 $\epsilon$ could be further improved. Depending on the assumption of the systematic error of the cross section measurements, we obtain $\epsilon <0.01\sim 0.02$ for the mass region $m_{A_D}<10\mathrm{GeV}$ under the integrated luminosity of $300{\mathrm{fb}}^{-1}$. We also discuss the complementary roles between the cross section and the single-spin asymmetry measurements in probing the dark photon.

arXiv comment5 pages, 2 figures, the published version

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