Emerging patterns of New Physics with and without Lepton Flavour Universal contributions

We perform a model-independent global fit to b→sℓ${}^{+}$ℓ${}^{-}$ observables to confirm existing New Physics (NP) patterns (or scenarios) and to identify new ones emerging from the inclusion of the updated LHCb and Belle measurements of R${}_K$ and R${}_{K^{\text{â}}\text{ˆ}\text{—}}$, respectively. Our analysis, updating Refs. Capdevila et al. (J Virto JHEP 1801:093, 2018) and Algueró et al. (J Matias Phys Rev D 99(7):075017, 2019) and including these new data, suggests the presence of right-handed couplings encoded in the Wilson coefficients C${}_{9\text{â}\text{€}\text{²}\mu }$ and C${}_{10\text{â}\text{€}\text{²}\mu }$. It also strengthens our earlier observation that a lepton flavour universality violating (LFUV) left-handed lepton coupling (C${}_{9\mu }^V$=−C${}_{10\mu }^V$), often preferred from the model building point of view, accommodates the data better if lepton-flavour universal (LFU) NP is allowed, in particular in C${}_9^U$. Furthermore, this scenario with LFU NP provides a simple and model-independent connection to the b→cτν anomalies, showing a preference of ≈7σ with respect to the SM. It may also explain why fits to the whole set of b→sℓ${}^{+}$ℓ${}^{-}$ data or to the subset of LFUV data exhibit stronger preferences for different NP scenarios. Finally, motivated by Z′ models with vector-like quarks, we propose four new scenarios with LFU and LFUV NP contributions that give a very good fit to data.