Sweeping the pion chimney for axion-like particles with KOTO

2025/08/11 by Reuven Balkin, Balkin, Reuven, Stefania Gori +5 · 3 voices
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph

paper · pdf · doi:10.48550/arxiv.2508.08402

arxiv published 2025/08/11 · arxiv updated 2026/06/10

Abstract

We demonstrate that novel limits on prompt axion-like particles (ALPs) in the hard-to-probe mass range near the neutral pion - the so-called pion chimney - may be obtained from recasting K_L → 3π⁰ → 6γ data taken by the J-PARC KOTO experiment, to search for K_L → 2π⁰a → 6γ. We also explore the power of KOTO 6γ data to probe K_L → 2π⁰a for a broader range of ALP masses, incorporating displaced decays.

Citations

• Probing CP and flavor violation in neutral kaon decays with ALPs
• Shining Light on the Dark Sector: Search for Axion-like Particles and Other New Physics in Photonic Final States with FASER
• KOTO vs. NA62 Dark Scalar Searches
• On the Distribution of the Likelihood Ratio

Cited by

• Probing CP and flavor violation in neutral kaon decays with ALPs

Discussions

• #arXiv Sweeping the pion chimney for axion-like particles with KOTO arxiv.org/abs/2508.08402 “from recasting K→3π⁰→6γ KOTO data to search for K→2π⁰ a→6γ. We also explore the power of KOTO 6γ data to p [bsky, 1 points, 0 comments]
• #arXiv Sweeping the pion chimney for axion-like particles with KOTO https://arxiv.org/abs/2508.08402 “from recasting K→3π⁰→6γ KOTO data to search for K→2π⁰ a→6γ. We also explore the power of KOTO 6γ d [bsky, 0 points, 0 comments]
• # arXiv Sweeping the pion chimney for axion-like particles with KOTO https:// arxiv.org/abs/2508.08402 “from recasting K→3π⁰→6γ KOTO data to search for K→2π⁰ a→6γ. We also explore the power of KOTO 6γ [mastodon, 0 points, 0 comments]

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