Constraining flavour patterns of scalar leptoquarks in the effective field theory

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 $\tau \to \mu \gamma$, ${\bar{B}}_s\to {\tau }^{\pm }{\mu }^{\mp }$ and $B^{+}\to K^{+}{\tau }^{+}{\mu }^{-}$ decays, whose branching ratios are close to the current experimental limits.

45 pages, 2 figures, 4 tables; v2 as published in JHEP

References in corpus (17)

• B-physics anomalies: a guide to combined explanations
• On the B to D* tau nu Sensitivity to New Physics
• Gauge leptoquark as the origin of B-physics anomalies
• The lifetime of the $B_c^{-}$ meson and the anomalies in $B\to D^{(\ast )}\tau \nu$
• $R(D^{\ast })$, $|V_{cb}|$, and the Heavy Quark Symmetry relations between form factors
• Extraction of $|V_{cb}|$ from $B\to D^{(\ast )}\ell {\nu }_{\ell }$ and the Standard Model predictions of $R(D^{(\ast )})$
• Leptoquark Flavor Patterns & B Decay Anomalies
• $\Delta M_s$ theory precision confronts flavour anomalies
• Bs mixing observables and Vtd/Vts from sum rules
• Low-energy phenomenology of scalar leptoquarks at one-loop accuracy
• Relating D0-anti-D0 Mixing and D0 -> l+l- with New Physics
• Combined explanations of $(g-2{)}_{\mu }$, $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$ anomalies in a two-loop radiative neutrino mass model
• Probing low energy scalar leptoquarks by the leptonic $W$ and $Z$ couplings
• On lepton flavour universality in semileptonic $B_c\to {\eta }_c,J/\psi$ decays
• Effective Theory Approach to New Physics with Flavour: General Framework and a Leptoquark Example
• Bottom-Flavored Mono-Tau Tails at the LHC
• Vacuum stability in an extended standard model with a leptoquark

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