The running mass $m_s$ at low scalefrom the heavy-light meson decay constants

A. M. Badalian, B. L. G. Bakker

It is shown that a 25(20)% difference between the decay constants $f_{D_s}(f_{B_s})$ and $f_D(f_B)$ occurs due to large differences in the pole masses of the $s$ and $d(u)$ quarks.…