lifetimes of doubly charmed baryons together with the relative spectator and nonspectator contributions to the total widths.[]{data-label="cc"}

From this Table we see the importance of nonspectator effects, producing huge differences in the values of lifetimes. The analogous results for other doubly heavy baryons can be found in Tables \[bc\] and \[bb\].

                              $\Xi_{bc}^{+}$   $\Xi_{bc}^{0}$   $\Omega_{bc}^{0}$
  -------------------------- ---------------- ---------------- -------------------
   $\sum b\to c$, ps$^{-1}$       0.632            0.632              0.631
   $\sum c\to s$, ps$^{-1}$       1.511            1.511              1.509
        PI, ps$^{-1}$             0.807            0.855              0.979
        WS, ps$^{-1}$             0.653            0.795              1.713
          $\tau$, ps               0.28             0.26              0.21

  : The lifetimes of $(bcq)$-baryons together with the relative spectator and nonspectator contributions to the total widths.[]{data-label="bc"}

                              $\Xi_{bb}^{0}$   $\Xi_{bb}^{-}$   $\Omega_{bb}^{-}$
  -------------------------- ---------------- ---------------- -------------------
   $\sum b\to c$, ps$^{-1}$       1.254            1.254              1.254
        PI, ps$^{-1}$               -             -0.0130            -0.0100
        WS, ps$^{-1}$             0.0189             -                  -
          $\tau$, ps               0.79             0.80              0.80

  : The lifetimes of $(bbq)$-baryons together with the relative spectator and nonspectator contributions to the total widths.[]{data-label="bb"}

A small comment concerns with the corrections to the spectator decays of heavy quarks, caused by the motion of heavy quarks inside the hadron and interactions with the light degrees of freedom. The corrections due to the quark-gluon operators of dimension 5 are numerically small [@vs]. The most important terms 