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

Extraction of the bare form factors for the semi-leptonic $B_s$ decays

29 Jul 2016, 18:10
20m
Building 67 Room 1003 (Highfield Campus, University of Southampton)

Building 67 Room 1003

Highfield Campus, University of Southampton

Highfield Campus, Southampton SO17 1BJ, UK
Talk Weak Decays and Matrix Elements Weak Decays and Matrix Elements

Speaker

Dr Mateusz Koren (NIC, DESY Zeuthen)

Description

The extraction of bare ground-state matrix elements for $B_s \to K\ell\nu$ decay at 2% precision poses a significant numerical challenge. Especially the B-sector, treated in HQET, is problematic due to large contamination by excited states combined with the signal-to-noise problem. The numerical setup that we use provides access to all time separations for both the two-point and three-point correlation functions of interest, for several different smearings. Using this data, we show how the extraction is achieved using two different techniques - the combined fits to two- and three-point correlation functions, as well as the ratio method (where we compare different possible ratio definitions, including summed ratios).

Primary author

Dr Mateusz Koren (NIC, DESY Zeuthen)

Co-authors

Dr Debasish Banerjee (NIC, DESY) Dr Felix Bahr (NIC, DESY Zeuthen) Prof. Hubert Simma (NIC, DESY Zeuthen) Prof. Rainer Sommer (NIC @ DESY)

Presentation Materials

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