Zusammenfassung

The extraction of the \$BK^*\$ transition form factors from lattice data is studied, applying non-relativistic effective field theory in a finite volume. The possible mixing of \$K\$ and \$K\$ 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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