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The branching fractions of the decays B+ηl+νl and B+ηl+νl are measured, where l is either an electron or a muon, using a data sample of 711 fb−1 containing 772 × 106 BB̅ pairs collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e collider. To reduce the dependence of the result on the form factor model, the measurement is performed over the entire q2 range. The resulting branching fractions are B(B+η ℓ + ν ℓ)=(2.83 ± 0.55 (stat.) ± 0.34(syst.)) x 10-5 and B(B+→η′ℓ+νℓ)=(2.79 ±1.29(stat.) ± 0.30(syst.))×10−5.

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Gebauer, U., Beleño, C., Frey, A., Adachi, I., Adamczyk, K., Aihara, H., Al Said, S., Asner, D. M., Atmacan, H., Aushev, T., Ayad, R., Babu, V., Bahinipati, S., Behera, P., Belous, K., Bennett, J., Bessner, M., Bhardwaj, V., Bhuyan, B., … Zhukova, V. (2022). Measurement of the branching fractions of the . Physical Review D, 106(3).

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