Constraining flavour patterns of scalar leptoquarks in the effective field theory
Marzia Bordone, Oscar Catà, Thorsten Feldmann, Rusa Mandal
Abstract
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 , $$ {\overline{B}}_s $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mover> <mml:mi>B</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>s</mml:mi> </mml:msub> </mml:math> → τ ± μ ∓ and B + → K + τ + μ − decays, whose branching ratios are close to the current experimental limits.