Searching for the axion-like particle at the EIC

Abstract

The axion-like particle (ALP) is a well motivated new particle candidate of beyond the Standard Model. In this work, we propose to probe the ALP through the photon fusion scattering at the upcoming Electron-Ion Collider (EIC) with electron and proton energy $E_e=20\mathrm{GeV}$ and $E_p=250\mathrm{GeV}$. It shows that we could constrain the effective coupling strength between ALP and photons to be $0.2{\mathrm{TeV}}^{-1}$ at $2\sigma$ confidence level with the integrated luminosity of $300{\mathrm{fb}}^{-1}$ for the mass range $m_a\in [5,40]\mathrm{GeV}$. Such bound could be much improved if we consider the nucleus beam at the EIC. We also demonstrate that the limits from the EIC could be stronger than the off $Z$-pole measurement at the LEP and the Light-by-Light scattering with pp collision at the LHC.

5 pages, 5 figures, published version

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