Volume 398 - The European Physical Society Conference on High Energy Physics (EPS-HEP2021) - T08: Flavour Physics and CP Violation
New Physics in $b\, \to\, s\, \nu\,\bar{\nu}$ decays ?
N. Rajeev* and R. Dutta
Full text: pdf
Pre-published on: January 12, 2022
Published on: May 12, 2022
Abstract
Measurements of various lepton flavor universal observables in $b \to\, s\,l^+ l^-$ transition decays continue to disagree
with the standard model expectations. The recent update of $R_K$ measurement from LHCb still indicates $3.1\sigma$
deviation from the standard model.
Similarly, the measurements of other observables such as $R_{K^*}$, $P_{5}^{\prime}$ and
$\mathcal{B}(B_s\, \to\, \phi \,\mu^+ \,\mu^-)$ continue to show disagreement with standard model predictions.
It is well known that there exists a very close relation between $b \to\, s\,l^+ l^-$ and
$b \to\, s\,\nu \bar{\nu}$ decays not only in standard model but also in beyond the standard model physics.
In beyond the standard model physics these decay processes are related via $SU(2)_L$ gauge symmetry which relates
neutrinos to the left handed charged leptons.
Moreover, the $B$ decays with $\nu \bar{\nu}$ final state
are theoretically cleaner channels than the corresponding $b \to\, s\,l^+ l^-$ neutral transitions
as they do not suffer from hadronic uncertainties beyond the form factors such as the non-factorizable
corrections and photonic penguin contributions.
Hence, we explore $B_s\, \to\, (\phi\,,\eta\,,\eta^\prime) \,\nu \,\bar{\nu}$ decays mediated via
$b\, \to\, s\, \nu\,\bar{\nu}$ transitions using the standard model effective field theory formalism, $Z'$ and scalar and vector leptoquarks new physics models.
We give predictions of branching ratio in standard model and in the presence of various new physics couplings.
DOI: https://doi.org/10.22323/1.398.0496
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