A minimal ALP model with mass near the pi0, couplings to photons, top quarks, and a sterile neutrino explains the B to K inv excess via off-shell sterile neutrino pairs and B to pi K anomalies via pi0 mixing.
Dispersive representation and shape of the Kl3 form factors: robustness
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abstract
An accurate low-energy dispersive parametrization of the scalar Kpi form factor was constructed some time ago in terms of a single parameter guided by the Callan-Treiman low-energy theorem. A similar twice subtracted dispersive parametrization for the vector Kpi form factor will be investigated here. The robustness of the parametrization of these two form factors will be studied in great detail. In particular the cut-off dependence, the isospin breaking effects and the possible, though not highly probable, presence of zeros in the form factors will be discussed. Interesting constraints in the latter case will be obtained from the soft-kaon analog of the Callan-Treiman theorem and a comparison with the recent tau --> K pi nu_tau data.
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Pedagogical review explaining how causality implies analyticity and its use in scattering amplitudes, form factors, and resonance extraction in hadronic physics.
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Axion-like particles solve the $B\to K\nu\bar\nu$ and $B\to \pi K$ puzzles
A minimal ALP model with mass near the pi0, couplings to photons, top quarks, and a sterile neutrino explains the B to K inv excess via off-shell sterile neutrino pairs and B to pi K anomalies via pi0 mixing.
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Dispersion relations: foundations
Pedagogical review explaining how causality implies analyticity and its use in scattering amplitudes, form factors, and resonance extraction in hadronic physics.