We present the results of a search for the 𝑏→𝑑⁢ℓ+⁢ℓ− flavor-changing neutral-current rare decays 𝐵+,0→(𝜂,𝜔,𝜋+,0,𝜌+,0)⁢𝑒+⁢𝑒− and 𝐵+,0→(𝜂,𝜔,𝜋0,𝜌+)⁢𝜇+⁢𝜇− using a 711  fb^−1 data sample that contains 772×10^6  𝐵⁢𝐵-bar events. The data were collected at the Y(4⁢S) resonance with the Belle detector at the KEKB asymmetric-energy 𝑒+⁢𝑒− collider. We find no evidence for signal and set upper limits on branching fractions at the 90% confidence level in the range (3.8–47)×10^−8 depending on the decay channel. The obtained limits are the world’s best results. This is the first search for the channels 𝐵+,0→(𝜔,𝜌+,0)⁢𝑒+⁢𝑒− and 𝐵+,0→(𝜔,𝜌+)⁢𝜇+⁢𝜇−.

Search for Rare 𝑏→𝑑⁢ℓ+⁢ℓ− Transitions at Belle

Bertacchi, V.;Bettarini, S.;Casarosa, G.;Corona, L.;de Marino, G.;Forti, F.;Massaccesi, L.;Moneta, S.;Rizzo, G.;Tenchini, F.;
2024-01-01

Abstract

We present the results of a search for the 𝑏→𝑑⁢ℓ+⁢ℓ− flavor-changing neutral-current rare decays 𝐵+,0→(𝜂,𝜔,𝜋+,0,𝜌+,0)⁢𝑒+⁢𝑒− and 𝐵+,0→(𝜂,𝜔,𝜋0,𝜌+)⁢𝜇+⁢𝜇− using a 711  fb^−1 data sample that contains 772×10^6  𝐵⁢𝐵-bar events. The data were collected at the Y(4⁢S) resonance with the Belle detector at the KEKB asymmetric-energy 𝑒+⁢𝑒− collider. We find no evidence for signal and set upper limits on branching fractions at the 90% confidence level in the range (3.8–47)×10^−8 depending on the decay channel. The obtained limits are the world’s best results. This is the first search for the channels 𝐵+,0→(𝜔,𝜌+,0)⁢𝑒+⁢𝑒− and 𝐵+,0→(𝜔,𝜌+)⁢𝜇+⁢𝜇−.
2024
Adachi, I.; Aggarwal, L.; Aihara, H.; Akopov, N.; Aloisio, A.; Al Said, S.; Asner, D.  M.; Atmacan, H.; Aushev, V.; Aversano, M.; Ayad, R.; Babu, V.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1274473
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