Abstract
We benefit from the lattice QCD determination by the HPQCD of the Standard Model (SM) form factors for the \( {\overline{B}}_s\to {D}_s \) [Phys. Rev. D 101 (2020) 074513] and the SM and tensor ones for the \( {\overline{B}}_s\to {D}_s^{\ast } \) (arXiv:2304.03137 [hep-lat]) semileptonic decays, and the heavy quark effective theory (HQET) relations for the analogous B → D(*) decays obtained by F.U. Bernlochner et al. in Phys. Rev. D 95 (2017) 115008, to extract the leading and sub-leading Isgur-Wise functions for the \( {\overline{B}}_s\to {D}_s^{\left(\ast \right)} \) decays. Further use of the HQET relations allows us to evaluate the corresponding scalar, pseudoscalar and tensor form factors needed for a phenomenological study of new physics (NP) effects on the \( {\overline{B}}_s\to {D}_s^{\left(\ast \right)} \) semileptonic decay. At present, the experimental values for the ratios \( {\mathcal{R}}_{D^{\left(\ast \right)}}=\Gamma \left[\overline{B}\to {D}^{\left(\ast \right)}{\tau}^{-}{\overline{\nu}}_{\tau}\left]/\Gamma \right[\overline{B}\to {D}^{\left(\ast \right)}{e}^{-}\left({\mu}^{-}\right){\overline{\nu}}_{e\left(\mu \right)}\right] \) are the best signal in favor of lepton flavor universality violation (LFUV) seen in charged current (CC) b → c decays. In this work we conduct a study of NP effects on the \( {\overline{B}}_s\to {D}_s^{\left(\ast \right)}{\tau}^{-}{\overline{\nu}}_{\tau } \) semileptonic decays by comparing tau spin, angular and spin-angular asymmetry distributions obtained within the SM and three different NP scenarios. As expected from SU(3) light-flavor symmetry, we get results close to the ones found in a similar analysis of the \( \overline{B}\to {D}^{\left(\ast \right)} \) case. The measurement of the \( {\overline{B}}_s\to {D}_s^{\left(\ast \right)}\ell {\overline{\nu}}_{\ell } \) semileptonic decays, which is within reach of present experiments, could then be of relevance in helping to establish or rule out LFUV in CC b → c transitions.
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Acknowledgments
N.P. thanks Physics and Astronomy at the University of Southampton for hospitality during the making of this work and a Generalitat Valenciana grant CIBEFP/2021/32. This research has been supported by the Spanish Ministerio de Ciencia e Innovación (MICINN) and the European Regional Development Fund (ERDF) under contracts PID2020-112777GB-I00 and PID2019-105439GB-C22, the EU STRONG-2020 project under the program H2020-INFRAIA-2018-1, grant agreement no. 824093 and by Generalitat Valenciana under contract PROMETEO/2020/023.
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Penalva, N., Flynn, J.M., Hernández, E. et al. Study of new physics effects in \( {\overline{B}}_s\to {D}_s^{\left(\ast \right)}{\tau}^{-}{\overline{\nu}}_{\tau } \) semileptonic decays using lattice QCD form factors and heavy quark effective theory. J. High Energ. Phys. 2024, 163 (2024). https://doi.org/10.1007/JHEP01(2024)163
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DOI: https://doi.org/10.1007/JHEP01(2024)163