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Detailed analysis of possible new-physics effects in the semileptonic decay Bs→Ds(*)τν¯

M. A. Ivanov1,*, J. N. Pandya2,†, P. Santorelli3,4,‡, N. R. Soni5,§, C. T. Tran6,∥, H. C. Tran6,¶, and Vo Quoc Phong7,8,**

  • *Contact author: ivanovm@theor.jinr.ru
  • †Contact author: jnpandya-phy@spuvvn.edu
  • ‡Contact author: Pietro.Santorelli@na.infn.it
  • §Contact author: nakul.soni-phy@msubaroda.ac.in
  • ∥Contact author: thangtc@hcmute.edu.vn
  • Contact author: catth@hcmute.edu.vn
  • **Contact author: vqphong@hcmus.edu.vn
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Phys. Rev. D 114, 014040 – Published 20 July, 2026

DOI: https://doi.org/10.1103/99s3-rh7p

Abstract

We study the semileptonic decays Bs→Ds(*)τν¯ as a promising probe for new physics (NP) beyond the standard model (SM). The extension of the SM is done through the introduction of four-fermion operators beyond the V−A structure with the corresponding Wilson coefficients characterizing their contribution. The constraints on these coefficients are obtained from recent experimental data. Form factors describing hadron transitions are calculated in our covariant quark model with infrared confinement. Theoretical predictions for the full set of observables in these channels are provided. We analyze possible NP effects to be tested in future experiments.

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Phys. Rev. D 114, 014040– Published 20 July, 2026
  • Received 11 March 2026
  • Accepted 18 June 2026
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