26-30 July 2021
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Europe/Berlin timezone

Pattern of New Physics in the angular analysis of $B_s \,\to\, D_s^{*}\,(\to\,D_s\,\pi,\, D_s\,\gamma)\, \tau\,\nu$ decays

Not scheduled
15m
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Poster Flavour Physics and CP Violation T08: Flavour Physics and CP Violation

Speaker

Nilakshi Das (National Institute of Technology, Silchar)

Description

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 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 $B_s \,\to\, D_s^{*}\,(\to\,D_s\,\pi,\, D_s\,\gamma)\, l\,\nu$ 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 1D and 2D new physics scenarios.

Email nilakshidas0225@gmail.com
Collaboration / Activity -
First author Nilakshi Das

Primary authors

Nilakshi Das (National Institute of Technology, Silchar) Dr Rupak Dutta (National Institute of Technology, Silchar)

Presentation Materials