Explaining Flavour Anomalies with Heavy Scalars

TL;DR

This paper reviews two TeV-scale scalar mediator models involving leptoquarks that aim to simultaneously explain multiple flavour anomalies observed in B-decays, muon g-2, and the Cabibbo angle.

Contribution

It introduces two novel scalar leptoquark models that provide unified explanations for several flavour anomalies within a TeV-scale framework.

Findings

Model 1 explains B-anomalies and muon g-2 at tree and loop levels.

Model 2 addresses B-anomalies, muon g-2, and Cabibbo-angle anomaly.

Both models successfully accommodate multiple flavour anomalies.

Abstract

Discrepancies between recent experimental results and their respective Standard Model predictions, known as flavour anomalies, are reported in semileptonic charged and neutral-current $B$-decays, the muon magnetic moment $(g-2)_\mu$, and the extraction of the Cabibbo angle. In this proceedings, we review two New Physics models that introduce two scalar mediators at the TeV scale and aim at a combined explanation of the flavour anomalies. The first model features the leptoquarks $S_1$ and $S_3$ and provides tree level solutions to both $B$-anomalies and one-loop level solution to the anomalous $(g-2)_\mu$. The second features the leptoquark $S_1$ and the charged singlet $\phi^+$. While $S_1$ provides the same solution to the charged-current $B$-anomaly and $(g-2)_\mu$ as in the first model, $\phi^+$ can accommodate the Cabibbo-angle anomaly independently and together with $S_1$ can resolve the neutral-current $B$-anomaly at one-loop.