Abstract
One kind of particularly interesting pseudoscalar particles, called axion-like particles (ALPs), have rich physical phenomenology at high- and low-energy collider experiments. After discussing most of single production channels of ALP at electron-positron colliders, we investigate the possibility of detecting this kind of new particles through the W^{+}W^{-} fusion process e^{+}e^{-}rightarrow {overline{nu }}_{e}nu _{e}a(rightarrow gamma gamma ) at the CLIC. The 3sigma and 5sigma bounds on the ALP parameter space at the three energy stages of the CLIC are obtained. We find that the bounds given by the CLIC are complementary to the existing experiments exclusion regions.
Highlights
After discovery of the Higgs boson in the CMS and ATLAS experiments [1,2], experiments at the LHC have made great achievements and demonstrated that the standard model (SM) is a correct model to explain most of observed phenomena at the electroweak scale
axion-like particles (ALPs) can be produced via massive vector boson fusion (VBF) processes (i.e. W+W−-fusion and ZZ-fusion processes) at high-energy e+e− colliders [42]
Our numerical results show that VBF processes can extend the e+e− sensitivity to a region of the ALP parameter space that is not covered by other experiments
Summary
After discovery of the Higgs boson in the CMS and ATLAS experiments [1,2], experiments at the LHC have made great achievements and demonstrated that the standard model (SM) is a correct model to explain most of observed phenomena at the electroweak scale. Deviations of experimental measurements from the SM predictions at or below the percent level are beyond the achievable precision at the LHC and is expected to be performed at the planned e+e− colliders with high luminosity and energy. It is well known that, compared to the LHC, the future e+e− colliders, such as the ILC [3–7], CLIC [8,9], FCC-ee [10,11], and CEPC [12–14] have higher luminosity and more clean experimental environment, which can study the SM observables at unprecedented accuracy, but would be very useful to discover the evidence of new physics beyond the SM. We will consider the possibilities of detecting ALPs via VBF processes at high-energy e+e− colliders like the CLIC. We will focus on ALPs that only couple to the electroweak gauge bosons and perform a careful investigation of the ALP signals at high-energy e+e− colliders from VBF processes. After summarizing the effective description of ALP interactions with the electroweak gauge bosons, we calculate and compare the production cross sections of ALPs via e+e− annihilation
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