Speaker
Greg Landsberg
(Brown University (US))
Description
We propose novel methods to determine the $\Upsilon(4S)\to B^+B^-$ and $\Upsilon(4S)\to B^0\bar B^0$ 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 $\Upsilon(5S)$ 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.
Co-authors
Florian Urs Bernlochner
(University of Bonn (DE))
Greg Landsberg
(Brown University (US))
Martin Jung
(Università di Torino & INFN)
Munira Khan
(Bonn Univ.)
Zoltan Ligeti
(Lawrence Berkeley National Lab. (US))
