Sensitivity of the future ${\mathbf{e}}^{-}\mathbf{p}$ collider to the coupling of axion-like particles with vector bosons

Abstract

Axion-like particles (ALPs) arise naturally in many extensions of the Standard Model (SM). We explore the discovery potential for ALPs of the Large Hadron electron Collider (LHeC) via the $W^{+}{W}^{-}$ fusion process. For concreteness, both cases of the ALP decaying to muon pairs and $b\overline{b}$ pairs are investigated. Our numerical results show that the LHeC with the center of mass energy of $1.3$ TeV and the integrated luminosity of $1$ ab${}^{-1}$ might be more sensitive than the LHC in probing ALPs over a range of masses from a few tens of GeV to $900$ GeV, where the promising sensitivities to the coupling of ALP with $W^{\pm }$ bosons reach nearly $0.15$ TeV${}^{-1}$ and $0.32$ TeV${}^{-1}$ for the signal processes $e^{-}p\to {\nu }_{e}ja(a\to {\mu }^{+}{\mu }^{-})$ and $e^{-}p\to {\nu }_{e}ja(a\to b\overline{b})$, respectively.

16 pages, 7 figures

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