$M$, GeV          3.478            3.478              3.578              6.82             6.82              6.92              10.093           10.093            10.193
   $M^{*}$, GeV        3.61              3.61              3.71                -                -                  -               10.193           10.193            10.293

  : The masses of doubly heavy baryons $M$, and $M^{*}$ stands for the mass of the baryon with lowest excited state of light quark-diquark system.[]{data-label="Bmasses"}

The wavefunctions as well as masses for the considered baryons are taken from [@DHS1; @DHS2], where their estimates in the non-relativistic model with the Buchmüller-Tye potential were done. The $b$-quark mass is obtained from the requirement, that for any given value of $c$-quark mass the theoretically computed $B_d$-meson lifetime equals to experimentally measured value. This matching condition leads to the following approximate relation $$m_b = m_c + 3.5~\mbox{GeV}. \label{mb-mc}$$ The $c$-quark mass is determined from the analogous matching procedure for the $B_c$-meson lifetime [@Onishchenko]. The $m_q^{*}$-values in Eq. (\[parameters\]) represent the constituent masses for the corresponding light quarks, used by us in estimations of hadronic matrix elements.[^7] For the value of light quark-diquark function at the origin we assume $$|\Psi^{dl} (0) |^2 = \frac{2}{3}\frac{f_D^2 M_D
k^{-\frac{4}{9}}}{12},$$ where $f_D = 170~\mbox{MeV}$. This expression obtained by performing the steps similar to [@Rujula; @Cortes] for the derivation of hyperfine splitting in the light quark-diquark system. The 