Leptoquark option for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>-meson anomalies and leptonic signatures
Hyun Min Lee
Abstract
We entertain the option of scalar leptoquarks to explain the anomalies in the semileptonic decays of $B$ mesons and the discrepancies in the lepton $(g\ensuremath{-}2{)}_{l}$'s including the recent results at Fermilab E989. The ${R}_{{K}^{(*)}}$ and ${R}_{{D}^{(*)}}$ anomalies can be accommodated by the specific couplings for triplet and singlet leptoquarks, respectively, subject to the bounds from $B\ensuremath{\rightarrow}K\ensuremath{\nu}\overline{\ensuremath{\nu}}$. We discuss the correlation between the leptonic signatures from leptoquarks such as $\ensuremath{\mu}\ensuremath{\rightarrow}e\ensuremath{\gamma}$ and the electric dipole moment of the electron and show that desirable neutrino masses can be generated dominantly by top-quark loops in the extension of the model with several doublet leptoquarks.