https://doi.org/10.1103/PhysRevLett.126.161801

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Document Type

Article

Abstract

We present a measurement of Rk+ , the branching fraction ratio B(B → K+μ+μ)=B(B → K*e+e),, for both charged and neutral B mesons. The ratio for the charged case R K* + is the first measurement ever performed. In addition, we report absolute branching fractions for the individual modes in bins of the squared dilepton invariant mass q2. The analysis is based on a data sample of 711 fb−1, containing 772 × 106 BB̅ events, recorded at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetricenergy e+e collider. The obtained results are consistent with standard model expectations.

Digital Object Identifier (DOI)

https://doi.org/10.1103/PhysRevLett.126.161801

APA Citation

Wehle, S., Adachi, I., Adamczyk, K., Aihara, H., Asner, D. M., Atmacan, H., Aulchenko, V., Aushev, T., Ayad, R., Babu, V., Behera, P., Berger, M., Bhardwaj, V., Biswal, J., Bozek, A., Bračko, M., Browder, T. E., Campajola, M., Cao, L., … Zhulanov, V. (2021). Test of lepton-flavor universality in . Physical Review Letters, 126(16). https://doi.org/10.1103/physrevlett.126.161801

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