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.

Search for an axion-like particle in B → K(*)a(→ γγ) decays at Belle / Belle, C., Adachi, I., Aggarwal, L., Ahmed, H., Ahn, Y., Aihara, H., Akopov, N., Alghamdi, S., Alhakami, M., Aloisio, A., Althubiti, N., Amos, K., Angelsmark, M., Anh Ky, N., Antonioli, C., Asner, D.M., Atmacan, H., Aushev, T., Aushev, V., Aversano, M., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2025:12(2025), pp. 109.0-109.26. [10.1007/jhep12(2025)109]

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

Gabrielli, A.;Gaudino, G.;Ghosh, D.;Giordano, R.;Gobbo, B.;Graziani, E.;Johnson, A.;Khan, M.;Kumar, R.;Li, Y.;Mancinelli, G.;Manfredi, R.;Mantovano, M.;Merola, M.;Park, H.;Park, J.;Park, K.;Raiz, S.;Schnell, G.;Serrano, J.;Soffer, A.;Veronesi, M.;Vitale, L.;Yuan, J.;
2025-01-01

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
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3123899
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