Accurate decay-constant ratios $f_{B^{\ast }}/f_B$ and $f_{B_s^{\ast }}/f_{B_s}$ from Borel QCD sum rules

Wolfgang Lucha, Dmitri Melikhov, Silvano Simula

We present our analysis of the decay constants of the beauty vector mesons $B^{\ast }$ and $B_s^{\ast }$ within the framework of dispersive sum rules for the two-point correlator of vector cur…