We report the first searches for charged-lepton-flavor violation in decays of χbJ(1P) (J=0, 1, and 2) to a pair of charged leptons using 158 million ϒ(2S) decays collected with the Belle detector in e+e- collisions at the KEKB collider. No significant signal is observed, and we set upper limits on the branching fractions for χbJ(1P) decays to e±μ∓ at the level of 10-6 and to e±τ∓ or μ±τ∓ at the level of 10-5. Limits on χb0(1P) decays are translated into bounds on the corresponding Wilson coefficients of scalar operators that mediate charged-lepton-flavor violation.

Abumusabh, M., Adachi, I., Aggarwal, A., Aggarwal, L., Ahmed, H., Ahn, Y., et al. (2026). Searches for Charged-Lepton-Flavor Violation in χbJ (1P) Decays. PHYSICAL REVIEW LETTERS, 137(7), 1-7 [10.1103/1rj5-2wvr].

Searches for Charged-Lepton-Flavor Violation in χbJ (1P) Decays

Di Canto A.;
2026

Abstract

We report the first searches for charged-lepton-flavor violation in decays of χbJ(1P) (J=0, 1, and 2) to a pair of charged leptons using 158 million ϒ(2S) decays collected with the Belle detector in e+e- collisions at the KEKB collider. No significant signal is observed, and we set upper limits on the branching fractions for χbJ(1P) decays to e±μ∓ at the level of 10-6 and to e±τ∓ or μ±τ∓ at the level of 10-5. Limits on χb0(1P) decays are translated into bounds on the corresponding Wilson coefficients of scalar operators that mediate charged-lepton-flavor violation.
2026
Abumusabh, M., Adachi, I., Aggarwal, A., Aggarwal, L., Ahmed, H., Ahn, Y., et al. (2026). Searches for Charged-Lepton-Flavor Violation in χbJ (1P) Decays. PHYSICAL REVIEW LETTERS, 137(7), 1-7 [10.1103/1rj5-2wvr].
Abumusabh, M.; Adachi, I.; Aggarwal, A.; Aggarwal, L.; Ahmed, H.; Ahn, Y.; Aihara, H.; Akopov, N.; Alghamdi, S.; Alhakami, M.; Aloisio, A.; Althubiti,...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1083410
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