Publication: Test of Lepton-Flavor Universality in B →k∗ℓ+ℓ- Decays at Belle
Дата
2021
Авторы
Wehle, S.
Adachi, I.
Adamczyk, K.
Aihara, H.
Pakhlov, P.
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Аннотация
© 2021 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.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 RK∗+ 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 BB¯ events, recorded at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. The obtained results are consistent with standard model expectations.
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Test of Lepton-Flavor Universality in B →k∗ℓ+ℓ- Decays at Belle / Wehle, S. [et al.] // Physical Review Letters. - 2021. - 126. - № 16. - 10.1103/PhysRevLett.126.161801
URI
https://www.doi.org/10.1103/PhysRevLett.126.161801
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https://openrepository.mephi.ru/handle/123456789/24114