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

Abstract

In the last few years, the ratios $R_{D^{(\ast )}}$ and of $R_{K^{(\ast )}}$ 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 Supersymemtric Standard Model can provide a better fit to the anomalies simultaneously. We perform this analysis employing an approximate, non-abelian ${\mathcal{G}}_f=U(2{)}_q\times U(2{)}_{\ell }$ 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 $B\to D^{(\ast )}\tau \overline{\nu }$, while the anomalies induced by $b\to s{\ell }^{+}{\ell }^{-}$ receive up to an approximate $30\%$ improvement. The consistency with all relevant low-energy constraints is assessed.

Comments: 21 pages, 3 figures. v3: minor typo corrections; results unchanged