Heavy + heavy and heavy + light pseudoscalar to vector semileptonic transitions

Abstract Using a symmetry-preserving regularisation of vector $$\times $$ × contact interaction (SCI), we complete systematic treatment twelve semileptonic transitions with meson final states: $$D\rightarrow \rho D → ρ , $$D_{(s)}\rightarrow K^*$$ ( s ) K ∗ $$D_s\rightarrow \phi ϕ $$B\rightarrow B $$B_s\rightarrow $$B_{(s)}\rightarrow D_{(s)}^*$$ $$B_c \rightarrow B_{(s)}^*, J/\psi D^*$$ c , J / ψ ; and thereby finalise unified analysis decays heavy + light pseudoscalar mesons to both states. The is marked by algebraic simplicity, few parameters, the ability consistently describe systems from Nambu-Goldstone modes mesons. Regarding behaviour transition form factors, SCI results compare well wherever sound experimental or independent theory analyses are available; hence, branching fraction predictions should be reasonable guide. Considering ratios $$R(D_{(s)}^{(*)})$$ R $$R(J/\psi )$$ $$R(\eta _c)$$ η whose values key tests lepton universality in weak interactions, agree Standard Model predictions. used predict precursor functions that evolve into universal Isgur–Wise function heavy-quark limit, conform those other sources where such available. study also exposes effects on factors flow interference between emergent hadron mass strong Higgs boson couplings via current-quark masses, including flavour symmetry violation.