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arXiv · 1605.03386

The $B\to K^*$ form factors on the lattice

Andria Agadjanov·Véronique Bernard·Ulf-G. Meißner·Akaki Rusetsky
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Abstract

The extraction of the $B\to K^*$ transition form factors from lattice data is studied, applying non-relativistic effective field theory in a finite volume. The possible mixing of $πK$ and $ηK$ states is taken into account. The two-channel analogue of the Lellouch-Lüscher formula is reproduced. Due to the resonance nature of the $K^*$, an equation is derived, which allows to determine the form factors at the pole position in a process-independent manner. The infinitely-narrow width approximation of the results is discussed.

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Andria Agadjanov, Véronique Bernard, Ulf-G. Meißner, Akaki Rusetsky. 2016-05-11. The $B\to K^*$ form factors on the lattice. https://doi.org/10.1016/j.nuclphysb.2016.07.005

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