B -> K^* Form Factors from Flavor Data to QCD and Back

Abstract

Sufficient control of transition form factors is a vital ingredient for the precision flavor programs including the nearer term searches at the Large Hadron Collider (LHC) and the forthcoming Belle II experiment. We improve on existing methods to extract B -> K^* form factor ratios at low hadronic recoil from B -> K^* l^+ l^- data on the angular observables F_L, A_T^(2) and P'_4 by adding heavy quark symmetry-based constraints and by investigating the cross talk between low and large recoil. The data-extracted form factor ratios i) provide benchmarks for the lattice and light cone sum rule predictions, the latter of which have been updated including improved uncertainty estimations and ii) allow to improve the predictions for benchmark observables. We find that present data on the forward-backward asymmetry A_FB and the angular observable P'_5 at low recoil are in good agreement with the Standard Model.

25 pages. References and clarifications added. Conclusions unchanged

References in corpus (11)

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• Form Factors from Light-Cone Sum Rules with B-Meson Distribution Amplitudes
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• Resonances gone topsy turvy - the charm of QCD or new physics in $b\to s{\ell }^{+}{\ell }^{-}$?
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• Recent $\mathbf{B}$ Physics Anomalies - a First Hint for Compositeness?
• Zooming in on $B\to K^{\ast }\ell \ell$ decays at low recoil
• Theoretical status of $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$: The path towards New Physics
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• Effect of $c\overline{c}$ resonances in the branching ratio and forward-backward asymmetry of the decay $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$
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• $B\to K^{\ast }{l}^{+}{l}^{-}$: Zeroes of angular observables as test of standard model
• Flavour Anomalies in $b\to s{\ell }^{+}{\ell }^{-}$ Processes - a round table Discussion
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• Theoretical Review of Rare B Decays
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• Charged and Neutral ${\bar{B}}_{u,d,s}\to \gamma$ Form Factors from Light Cone Sum Rules at NLO
• Towards the Identification of New Physics through Correlations between Flavour Observables