# Form factor ratios for Bs→Kℓν and Bs→Dsℓν semileptonic decays and |Vub/Vcb|

#### Form factor ratios for Bs→Kℓν and Bs→Dsℓν semileptonic decays and |Vub/Vcb|

- Event time: 2:00pm
- Event date: 24th October 2018
- Speaker: Christopher Bouchard (University of Glasgow)
- Location: Higgs Centre Seminar Room, Room 4305, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB

### Event details

I will present a lattice QCD determination of the ratio of the scalar and vector form factors for two semileptonic decays of the Bs meson: Bs→Kℓν and Bs→Dsℓν. In conjunction with future experimental data, results for these correlated form factors will provide a new method to extract |Vub/Vcb|, which may elucidate the current tension between exclusive and inclusive determinations of these Cabibbo-Kobayashi-Maskawa mixing matrix parameters. In addition to the form factor results, we determine the ratio of the differential decay rates, and forward-backward and polarization asymmetries, for the two decays.

#### Event resources

### About Particle Physics Theory seminars

The Particle Physics Theory seminar is a weekly series of talks reflecting the diverse interests of the group. Topics include analytic and numerical calculations based on the Standard Model of elementary particle physics, theories exploring new physics, as well as more formal developments in gauge theories and gravity..