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Study of Bs→ℓ+ℓ−γ decays in covariant quark model

S. Dubnička1, A. Z. Dubničková2, M. A. Ivanov3,*, A. Liptaj1,†, P. Santorelli4,5,‡, and C. T. Tran4,5,§

  • 1Institute of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 84511 Bratislava, Slovakia
  • 2Department of Theoretical Physics, Comenius University, Mlynská dolina F1, 84248 Bratislava, Slovakia
  • 3Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia
  • 4Dipartimento di Fisica “E. Pancini,” Università di Napoli Federico II, Complesso Universitario di Monte S. Angelo, Via Cintia, Edificio 6, 80126 Napoli, Italy
  • 5Instituto Nazionale di Fisica Nucleare, Sezione di Napoli, 80126 Napoli, Italy

  • *ivanovm@theor.jinr.ru
  • †andrej.liptaj@savba.sk
  • ‡Pietro.Santorelli@na.infn.it
  • §Corresponding author. tran@na.infn.it
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Phys. Rev. D 99, 014042 – Published 30 January, 2019

DOI: https://doi.org/10.1103/PhysRevD.99.014042

Abstract

We study the rare radiative leptonic decays Bs→ℓ+ℓ−γ (ℓ=e, μ, τ) within the Standard Model, considering both the structure-dependent amplitude and bremsstrahlung. In the framework of the covariant confined quark model developed by us, we calculate the form factors characterizing the Bs→γ transition in the full kinematical region of the dilepton momentum squared and discuss their behavior. We provide the analytic formula for the differential decay distribution and give predictions for the branching fractions in both cases: with and without long-distance contributions. Finally, we compare our results with those obtained in other approaches.

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Phys. Rev. D 99, 014042– Published 30 January, 2019
  • Received 19 August 2018
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Published by the American Physical Society under the terms of the 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.

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