Properties of doubly heavy baryons in QCD

The study of the properties doubly heavy baryons represents a promising area in particle physics. It can provide us with information about Cabibbo-Kobayashi-Maskawa (CKM) matrix elements and low energy dynamics QCD. They have very rich phenomenology. investigation weak, electromagnetic, strong decays has vital importance for understanding baryons. main ingredients such studies are spectroscopic parameters, coupling constants, transition form factors. For calculations these quantities, non-perturbative methods needed. One is QCD sum rules. In present work, we review our on within rules method, focusing mainly mass constants addition, radiative estimated using vector dominance model. We also make few remarks semileptonic