Abstract
We explore the possibility of searching for axionlike particle (ALP) by $ep$ collisions via the subprocess $e^{-}\gamma \rightarrow e^{-}a \rightarrow e^{-}\gamma\gamma$. Sensitivities to the effective ALP-photon coupling $g_{a\gamma\gamma}$ for its mass in the range of 10 GeV $< M_{a}< 3$ TeV are obtained for the LHeC and its high-energy upgrade, FCC-eh. Comparing to existing bounds on the ALP free parameters, we find that the bounds given by $ep$ colliders are competitive and complementary to other colliders.
Highlights
Axionlike particles (ALPs) were originally motivated by the axion, which results from the dynamical solution to the strong CP problem of the standard model (SM) [1]
The existence of ALPs is a generic feature of many extensions of the SM that extend well beyond axions
Both axions and ALPs may be excellent candidates to explain the nature of dark matter (DM)
Summary
Axionlike particles (ALPs) were originally motivated by the axion, which results from the dynamical solution to the strong CP problem of the standard model (SM) [1]. Any model with global U(1) symmetry, which is spontaneously broken, predicts the existences of ALPs and their masses and couplings are independent parameters. They can couple to the SM fermions and electroweak gauge bosons via dimension-5 operators [3]. At eþe− colliders, production of ALP can be studied via photon fusion and ALP-strahlung in association with a photon, Z, or Higgs boson [5]. Our numerical results demonstrate that, compared with other colliders, the bounds given by the LHeC on the ALP free parameters for its mass in the range of 10–100 GeV are competitive and complementary.
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