The B→K⁎ form factors on the lattice

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 $\pi K$ and $\eta K$ states is taken into account. The two-channel analogue of the Lellouch-L\"uscher 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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Submitted on : Thursday, June 9, 2016 - 11:42:21 AM
Last modification on : Thursday, January 11, 2018 - 6:12:41 AM

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A. Agadjanov, V. Bernard, U.G. Meißner, A. Rusetsky. The B→K⁎ form factors on the lattice. Nuclear Physics B, Elsevier, 2016, 910, pp.387-409. ⟨10.1016/j.nuclphysb.2016.07.005⟩. ⟨in2p3-01329468⟩

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