Challenges in Semileptonic B Decays

Novel approaches to determine B± and B0 meson production fractions

26 Sept 2024, 17:30

30m

Other

Speaker

Greg Landsberg (Brown University (US))

Description

We propose novel methods to determine the $\mathrm{{\rm Y}}(4S)\to B^{+}{B}^{-}$ and $\mathrm{{\rm Y}}(4S)\to B^0{\overline{B}}^0$ decay rates. The precision to which they and their ratio are known yields at present a limiting uncertainty around 2% in measurements of absolute $B$ decay rates, and thus in a variety of applications, such as precision determinations of elements of the Cabibbo-Kobayashi-Maskawa matrix and flavor-symmetry relations. The new methods we propose are based in one case on exploiting the $\mathrm{{\rm Y}}(5S)$ datasets, in the other case on the different average number of charged tracks in $B^{\pm }$ and $B^0$ decays. We estimate future sensitivities using these methods and discuss possible measurements of $f_d/f_u$ at the (HL-)LHC.

Presentation materials

ProductionFractions-Vienna24.pdf