Abstract
Future muon colliders with center-of-mass energy of \( \mathcal{O} \)(1 − 10) TeV can provide a clean high-energy environment with advantages in searches for TeV-scale axion-like particles (ALPs), pseudo-Nambu-Goldstone bosons associated with spontaneously broken global symmetries, which are widely predicted in physics beyond the Standard Model (SM). We exploit ALP couplings to SM fermions, and guided by unitarity constraints, build a search strategy focusing on the ALP decay to top quark pairs at muon colliders. It is found that a large parameter space of TeV-scale ALPs with TeV-scale decay constants can be probed by utilizing the ALP-top quark coupling.
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Acknowledgments
SC is supported by the Director, Office of Science, Office of High Energy Physics of the U.S. Department of Energy under the Contract No. DE-AC02-05CH1123. YN is supported by Natural Science Foundation of China under grant No. 12150610465.
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Chigusa, S., Girmohanta, S., Nakai, Y. et al. Aiming for tops of ALPs with a muon collider. J. High Energ. Phys. 2024, 77 (2024). https://doi.org/10.1007/JHEP01(2024)077
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DOI: https://doi.org/10.1007/JHEP01(2024)077