No ALP signal is seen in three-photon events at Belle II; 95% CL upper limits on g_aγγ reach ~10⁻⁴ GeV⁻¹ and are the most restrictive over nearly 0.17–5 GeV/c².
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Search for axion-like particles decaying to two photons at Belle II
No ALP signal is seen in three-photon events at Belle II; 95% CL upper limits on g_aγγ reach ~10⁻⁴ GeV⁻¹ and are the most restrictive over nearly 0.17–5 GeV/c².