Atmospheric axionlike particles at Super-Kamiokande

@article{Cheung2022AtmosphericAP,
  title={Atmospheric axionlike particles at Super-Kamiokande},
  author={Kingman Cheung and Jui-Lin Kuo and Po-Yan Tseng and Zeren Simon Wang},
  journal={Physical Review D},
  year={2022}
}
We consider a muonphilic axion-like-particle (ALP), denoted as a , lighter than twice the muon mass. ALPs of this mass range dominantly decay into a pair of photons, induced by a triangular muon loop. Such light muonphilic ALPs are naturally long-lived. At the atmosphere, the ALPs are copiously produced from charged-meson decays in air showers, such as π ± → µ ± νa , via the ALP-muon coupling g aµµ . After propagating tens of kilometers, the ALPs decay with a → γγ inside large-volume Cherenkov… 

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