4.7 Article

Atmospheric axionlike particles at Super-Kamiokande

Journal

PHYSICAL REVIEW D
Volume 106, Issue 9, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.106.095029

Keywords

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Funding

  1. Ministry of Science and Technology (MoST) of Taiwan [MoST-110-2811-M-007-542-MY3]
  2. U.S. National Science Foundation (NSF) Theoretical Physics Program [PHY1915005]
  3. MoST [MoST-111-2112-M-007-012-MY3, MoST-110-2112-M-007-017-MY3]

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This paper investigates a muonphilic axionlike particle (ALP) with a mass lighter than twice the muon mass. In the atmosphere, ALPs in this mass range are produced abundantly from charged-meson decay in air showers and decay inside large-volume Cherenkov detectors. The study finds that current observations constrain the mass range and coupling of muonphilic ALPs.
We consider a muonphilic axionlike 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 pi(+/-) -> mu(+/-)va, via the ALP-muon coupling g(a)(mu mu). After propagating tens of kilometers, the ALPs decay with a -> gamma gamma inside large-volume Cherenkov detectors near Earth's surface, such as Super-Kamiokande (SK). We find the present SK observation constrains on muonphilic ALPs of mass range [1 MeV, 30 MeV] and ALP-muon coupling [10(-3),10(2)], assuming the proper decay length c tau(a) in [10(-3) km, 10(6) km] either dependent on or independent of g(a)(mu mu). We conclude that atmospheric searches of such exotic states can be complementary to collider and beam-dump experiments as well as astrophysical probes.

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