Constraining flavour patterns of scalar leptoquarks in the effective field theory

摘要

A bstract We investigate the viability of extending the Standard Model with S _(1)and S _(3)scalar leptoquarks when the flavour structure is parametrized in terms of Froggatt-Nielsen charges. In contrast to a similar analysis with a vector leptoquark, we find essentially two solutions for the charges that fit the experimental constraints, which are dominated by the current tensions in B decays. These two scenarios differ in their estimate of the anomalous magnetic moment of the muon, ( g ? 2), but they both predict sizeable contributions to τ → μγ , B ˉ s documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$ {overline{B}}_s $$end{document} → τ ~( ± ) μ ~(?)and B ~(+) → K ~(+) τ ~(+) μ ~( ? )decays, whose branching ratios are close to the current experimental limits.