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2023

Dispersive Analysis of $B\to K^{(*)}$ and $B_s\to \phi$ Form Factors

Gubernari, Nico, Reboud, Méril, van Dyk, Danny et al.

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We perform the first simultaneous dispersive analysis of the $B\to K$, $B\to K^*$, and $B_s\to \phi$ form factors.

By means of an improved parametrization, we take into account the form factors' below-threshold branch cuts arising from on-shell $\bar{B}_s \pi^0$ and $\bar{B}_s \pi^0 \pi^0$ states, which so far have been ignored in the literature.
In this way, we eliminate a source of hard-to-quantify systematic uncertainties.
We provide machine-readable files to obtain the full set of the $\bar{B}\to \bar{K}^{(*)}$ and $\bar{B}_s\to \phi$ form factors in and beyond the entire semileptonic phase space.

Dispersive Analysis of $B\to K^{(*)}$ and $B_s\to \phi$ Form Factors · Around

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