Chobanova, VeronikaDalseno, JeremyKíesling, Christian M.Abdesselam, A.Adachi, IchiroAihara, HiroakiAsner, David M.Aushev, TagirAyad, RachidBabu, V.2026-09-032026-09-032016-02-23Chobanova, V., Dalseno, J., Kiesling, C., Abdesselam, A., Adachi, I., Aihara, H., Asner, D. M., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bahinipati, S., Bakich, A. M., Barberio, E., Behera, P., Bhardwaj, V., Bhuyan, B., Biswal, J., … Bobrov, A. (2016). First observation of the decay 𝐵⁰ → 𝜓(2𝑆)𝜋⁰. Physical Review D, 93(3), Artículo 031101(R). https://doi.org/10.1103/physrevd.93.0311012470-0029https://hdl.handle.net/2183/49151[Abstract] We report a measurement of the 𝐵⁰ → 𝜓(2𝑆)𝜋⁰ branching fraction based on the full ϒ(4𝑆) data set of 772 × 10⁶ 𝐵𝐵 pairs collected by the Belle detector at the KEKB asymmetric-energy 𝑒⁺𝑒¯ collider. We obtain ℬ(𝐵⁰ → 𝜓(2𝑆)𝜋⁰) = (1.17 ± 0.17(stat) ± 0.08(syst)) × 10¯⁵. The result has a significance of 7.2 standard deviations and is the first observation of the decay 𝐵⁰ → 𝜓(2𝑆)𝜋⁰.eng© American Physical SocietyBranching fractionRare decaysBottom mesonsjournal articleopen access10.1103/physrevd.93.031101