predictions in the heavy quark sector of Standard Model (SM), such as decays, distributions and partial width asymmetries involving the CP violation[^1] for the heavy hadrons. The sensitivity of Wilson coefficients to virtual corrections caused by some higher-scale interactions makes this approach to be invaluable in searching for a “new” physics at forthcoming experiments.

The approach under discussion has been successfully used in the description of weak decays of the hadrons containing a single heavy quark, as carried out in the framework of Heavy Quark Effective Theory (HQET) [@HQET], in the annihilation and radiative decays of heavy quarkonia $Q\bar Q$, where one used the framework of non-relativistic QCD (NRQCD) [@NRQCD], and in the weak decays of long-lived heavy quarkonium with mixed flavours $B_c^+$ [@Beneke] [^2]. The experimental data on the weak decays of heavy hadrons can be used for the determination of basic properties of weak interactions at a fundamental level, in particular, for the extraction of CKM matrix elements. The same approach is also valid for the baryons containing two heavy quarks.

In addition to the information extracted from the analysis of hadrons with a single heavy flavor, the baryons with two heavy quarks, $QQ^\prime q$, provide a way 