We report a search for an axion-like particle a in B → K(*)a decays using data collected with the Belle detector at the KEKB asymmetric-energy electron-positron collider. The search is based on a 711 fb−1 data sample collected at the Υ(4S) resonance energy, corresponding to a sample of 772 × 106 Υ(4S) events. In this study, we search for the decay of the axion-like particle into a pair of photons, a → γγ. We scan the two-photon invariant mass in the range 0.16 GeV–4.50 GeV for the K modes and 0.16 GeV–4.20 GeV for the K* modes. No significant signal is observed in any of the modes, and 90% confidence level upper limits are established on the coupling to the W boson, gaW, as a function of a mass. The limits range from 3 × 10−6 GeV−1 to 3 × 10−5 GeV−1, improving the current constraints on gaW by a factor of two over the most stringent previous experimental results.

Adachi, I., Aggarwal, L., Ahmed, H., Ahn, Y., Aihara, H., Akopov, N., et al. (2025). Search for an axion-like particle in B → K(*)a(→ γγ) decays at Belle. JOURNAL OF HIGH ENERGY PHYSICS, 2025(12), 0-26 [10.1007/JHEP12(2025)109].

Search for an axion-like particle in B → K(*)a(→ γγ) decays at Belle

Di Canto A.;
2025

Abstract

We report a search for an axion-like particle a in B → K(*)a decays using data collected with the Belle detector at the KEKB asymmetric-energy electron-positron collider. The search is based on a 711 fb−1 data sample collected at the Υ(4S) resonance energy, corresponding to a sample of 772 × 106 Υ(4S) events. In this study, we search for the decay of the axion-like particle into a pair of photons, a → γγ. We scan the two-photon invariant mass in the range 0.16 GeV–4.50 GeV for the K modes and 0.16 GeV–4.20 GeV for the K* modes. No significant signal is observed in any of the modes, and 90% confidence level upper limits are established on the coupling to the W boson, gaW, as a function of a mass. The limits range from 3 × 10−6 GeV−1 to 3 × 10−5 GeV−1, improving the current constraints on gaW by a factor of two over the most stringent previous experimental results.
2025
Adachi, I., Aggarwal, L., Ahmed, H., Ahn, Y., Aihara, H., Akopov, N., et al. (2025). Search for an axion-like particle in B → K(*)a(→ γγ) decays at Belle. JOURNAL OF HIGH ENERGY PHYSICS, 2025(12), 0-26 [10.1007/JHEP12(2025)109].
Adachi, I.; Aggarwal, L.; Ahmed, H.; Ahn, Y.; Aihara, H.; Akopov, N.; Alghamdi, S.; Alhakami, M.; Aloisio, A.; Althubiti, N.; Amos, K.; Angelsmark, M....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1084159
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