PoS - Proceedings of Science
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:
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
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