Constraining flavour patterns of scalar leptoquarks in the effective field theory

Abstract

Abstract 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 ¯ s $$ {\overline{B}}_s $$ → τ ± μ ∓ and B + → K + τ + μ − decays, whose branching ratios are close to the current experimental limits.

Keywords

• Beyond Standard Model
• Effective Field Theories