PoS - Proceedings of Science
Volume 398 - The European Physical Society Conference on High Energy Physics (EPS-HEP2021) - T08: Flavour Physics and CP Violation
Pattern of New Physics in the angular analysis of $B_s \,\to\, D_s^{*}\,(\to\,D_s\,\pi,\, D_s\,\gamma)\, \tau\,\nu$ decays
N. Das* and R. Dutta
Full text: pdf
Pre-published on: March 04, 2022
Published on: May 12, 2022
Decoding the exact Lorentz structure of possible new physics in various $B$ decays involving $b\to\, c\, l\,\nu$ charged current and $b\, \to\, s\, l\,l$ neutral current transition is very crucial.
There still exists a long standing discrepancy in the combined measurements of the ratio of branching ratio
$R_{D^{(*)}}$ in $B \,\to\, D^{(*)}\, l\,\nu$ decays which stands $3\sigma$ away from the standard model expectations.
In addition, the lepton polarization fraction and longitudinal polarization fraction of $D^*$ meson
in $B \,\to\, D^{*}\, \tau\,\nu$ decays also witness considerable deviations from SM expectations.
In this context, we perform a detailed angular analysis of $B_s \,\to\, D_s^{*}\,(\to\,D_s\,\gamma,\, D_s\,\pi)\, l\,\nu$ decays in a model independent effective field theory formalism.
Under the SU(3) favor symmetry both $B \,\to\, D^{*}$ and $B_s \,\to\, D_s^{*}$ decays exhibit
similar properties and hence this decay channel can, in principle provide complementary
information regarding the anomalies present in $B \,\to\, D^{*}\, l\,\nu$ decays.
We give predictions of various physical observables in standard model and in the presence of various new physics couplings.
DOI: https://doi.org/10.22323/1.398.0498
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.