Revisiting R-parity violating interactions as an explanation of the B-physics anomalies

Abstract

Abstract In the last few years, the ratios $$R_{D^{(*)}}$$ RD(∗) and of $$R_{K^{(*)}}$$ RK(∗) have reportedly exhibited significant deviations from the relevant standard model predictions, hinting towards a possible violation of Lepton Flavor Universality and a window to New Physics. We investigate to what extent the inclusion of R-parity violating couplings in the minimal supersymmetric standard model can provide a better fit to the anomalies simultaneously. We perform this analysis employing an approximate, non-abelian $$\mathcal {G}_f=U(2)_q \times U(2)_\ell $$ Gf=U(2)q×U(2)ℓ flavour symmetry, which features a natural explanation of the appropriate hierarchy of the R-parity violating couplings. We show that, under the requirement of a supersymmetric spectrum with much heavier left-handed doublet superpartners, our assumption favors a considerable enhancement in the tree-level charged-current $$B \rightarrow D^{(*)} \tau \overline{\nu }$$ B→D(∗)τν¯ , while the the anomalies induced by $$b \rightarrow s\ell ^+\ell ^-$$ b→sℓ+ℓ- receive up to an approximate $$30 \%$$ 30% improvement. The consistency with all relevant low-energy constraints is assessed.