# The 34th International Symposium on Lattice Field Theory (Lattice 2016)

24-30 July 2016
Highfield Campus, University of Southampton
Europe/London timezone

## $B\to K^*$ decays in a finite volume

26 Jul 2016, 14:00
20m
Building 67 Room 1003 (Highfield Campus, University of Southampton)

### Building 67 Room 1003

#### Highfield Campus, University of Southampton

Talk Theoretical Developments

### Speaker

Dr Akaki Rusetski (HISKP, University of Bonn, Germany)

### Description

We propose a framework for the extraction of the $B\to K^*$ decay form factors from lattice data, based on the non-relativistic effective field theory in a finite volume. A possible admixture of the $\eta K$ channel is studied, and the multi-channel Lellouch-Luescher formula is reproduced. Further, a procedure is formulated for the extraction of the form-factors at the resonance pole. The definition of the photon virtuality at the resonance pole is discussed. The limit of an infinitely narrow resonance is investigated in detail in the multi-channel case.

### Primary author

Dr Akaki Rusetski (HISKP, University of Bonn, Germany)

### Co-authors

Mr Andria Agadjanov (HISKP, University of Bonn) Prof. Ulf-G. Meissner (HISKP, University of Bonn and FZ Juelich) Prof. Veronique Bernard (IPN, University Paris-Sud)

 Slides