Jun 5 – 9, 2023
Genova, Italy
Europe/Rome timezone

Study of new physics effects in $\bar B_s\to D^{(*)}_s\tau^-\bar\nu_\tau$ semileptonic decays using Standard Model lattice QCD form factors and heavy quark effective theory

Jun 9, 2023, 9:50 AM
DAD - Room 0B (Genova, Italy)

DAD - Room 0B

Genova, Italy

Contributed Hadrons and physics beyond the standard model Hadrons and physics beyond the standard model


Neus Penalva (IFIC (CSIC-UV))


We benefit from the lattice QCD determination of the Standard Model (SM) form factors for the $\bar B_s\to D_s^{*}$ and $\bar B_s\to D_s$ semileptonic decays carried out by the HPQCD collaboration in Refs. Phys. Rev. D 105, 094506 (2022) and Phys. Rev. D 101, 074513 (2020), and the heavy quark effective theory (HQET) relations for the analogous $B\to D^{(*)}$ decays obtained by F.U. Bernlochner et al. in Phys. Rev. D 95, 115008 (2017), to extract the leading and sub-leading Isgur-Wise functions for the $\bar B_s\to D_s^{(*)}$ decays. Further use of the HQET relations allows us to evaluate the corresponding form factors needed for a phenomenological study of new physics (NP) effects on the $\bar B_s\to D_s^{(*)}$ semileptonic decay. In this work, we conduct a study of NP effects on the $\bar B_s\to D_s^{(*)}\tau^-\bar\nu_\tau$ semileptonic decays by comparing tau spin, angular and spin-angular asymmetry distributions obtained within the SM and three different NP scenarios.

Primary author

Neus Penalva (IFIC (CSIC-UV))


Eliecer Hernández (Universidad de Salamanca) Jonathan Flynn (University of Southampton) Juan Nieves (IFIC (CSIC-UV))

Presentation materials