We present a search for the rare flavor-changing neutral-current decay B0→K∗0τ+τ- with data collected by the Belle II experiment at the SuperKEKB electron-positron collider. The analysis uses a 365 fb-1 data sample recorded at the center-of-mass energy of the ϒ(4S) resonance. One of the B mesons produced in the ϒ(4S)→B0B¯0 process is fully reconstructed in a hadronic decay mode, while its companion B meson is required to decay into a K∗0 and two τ leptons of opposite charge. The τ leptons are reconstructed in final states with a single electron, muon, charged pion or charged ρ meson, and additional neutrinos. We set an upper limit on the branching fraction of B(B0→K∗0τ+τ-)<1.8×10-3 at the 90% confidence level, which is the most stringent constraint reported to date.

Search for B^{0}→K^{*0}τ^{+}τ^{-} Decays at the Belle II Experiment / Adachi, I., Adamczyk, K., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., Alhakami, M., Aloisio, A., Althubiti, N., Angelsmark, M., Anh Ky, N., Asner, D. m., Atmacan, H., Aushev, V., Aversano, M., Ayad, R., Babu, V., Bae, H., Baghel, N. k., Bahinipati, S., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 135:15(2025), pp. 151801.1-151801.8. [10.1103/v1q3-9dy8]

Search for B^{0}→K^{*0}τ^{+}τ^{-} Decays at the Belle II Experiment

Dorigo, M.;Gabrielli, A.;Ganiev, E.;Ghosh, D.;Manfredi, R.;Mantovano, M.;Raiz, S.;Vitale, L.;
2025-01-01

Abstract

We present a search for the rare flavor-changing neutral-current decay B0→K∗0τ+τ- with data collected by the Belle II experiment at the SuperKEKB electron-positron collider. The analysis uses a 365 fb-1 data sample recorded at the center-of-mass energy of the ϒ(4S) resonance. One of the B mesons produced in the ϒ(4S)→B0B¯0 process is fully reconstructed in a hadronic decay mode, while its companion B meson is required to decay into a K∗0 and two τ leptons of opposite charge. The τ leptons are reconstructed in final states with a single electron, muon, charged pion or charged ρ meson, and additional neutrinos. We set an upper limit on the branching fraction of B(B0→K∗0τ+τ-)<1.8×10-3 at the 90% confidence level, which is the most stringent constraint reported to date.
2025
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3121278
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