Impact on L-observables of a new combined analysis of Bd,s → K(∗) form factors

A bstract We explore the impact of a combined analysis of B d , s → K (∗) form factors on a set of L -observables. The L -observables are constructed from ratios of branching fractions in B s → VV , PP , PV versus B d → VV , PP , PV decays with P = K 0 , $$ {\overline{K}}^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mover> <mml:mi>K</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mn>0</mml:mn> </mml:msup> </mml:math> and V = K ∗0 , $$ {\overline{K}}^{\ast 0} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mover> <mml:mi>K</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mrow> <mml:mo>∗</mml:mo> <mml:mn>0</mml:mn> </mml:mrow> </mml:msup> </mml:math> , thereby partially reducing their hadronic uncertainties. We show the change of the Standard Model predictions of the L -observables under different determinations of the ratio of the relevant form factors (with correlations) including lattice QCD data and a novel light-cone sum rule analysis. In addition, we provide precise results for all B d , s → K (∗) form factors in machine-readable files. We find that the inclusion of our up-to-date results, as well as the use or omission of lattice QCD data for the form factors, has a significant impact on the L -observables. We also discuss how the New Physics interpretation is affected by the updated form factors and present revised predictions for the mechanism identified in our analysis of B → VP decays, now employing more suitable new experimental observables defined in this paper.