Abstract
We investigate the prospects for discovering axion-like particles (ALPs) via a light-by-light (LBL) scattering at two colliders, the future circular collider (FCC-ee) and circular electron-positron collider (CEPC). The promising sensitivities to the effective ALP-photon coupling $g_{a\gamma\gamma}$ are obtained. Our numerical results show that the FCC-ee and CEPC might be more sensitive to the ALPs with mass 2 GeV $\sim$ 10 GeV than the LHC and CLIC.
Highlights
At present, the strong-CP is still one of the theoretical problems that the standard model (SM) does not explain
The axionlike particle (ALP) is a generalization of the QCD axion, which is predicted by new physics models with the breaking of global Uð1Þ symmetry [4,5,6,7]
The ALP interactions with the SM fermions and gauge bosons arise through five-dimensional operators, and their masses can be treated independently of their couplings [8], while their couplings to the Higgs bosons are given by dimension-six operators and higher [9,10]
Summary
The strong-CP is still one of the theoretical problems that the standard model (SM) does not explain. The ALP interactions with the SM fermions and gauge bosons arise through five-dimensional operators, and their masses can be treated independently of their couplings [8], while their couplings to the Higgs bosons are given by dimension-six operators and higher [9,10] This property makes ALPs have a much wider parameter space and generate rich phenomenology at low- and high-energy experiments. Using the proton tagging technique, the LHC generally is more sensitive to the heavy ALP searched by LBL scattering than other processes, especially, in the mass region 0.6–2 TeV, the lowest values of the coupling of ALP with a pair of photons in the range of 0.4–0.06 TeV−1 [24].
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