Semileptonic decay of the triply heavy $ {\mathrm{\Omega }}_{ccb}$ to the observed $ {\mathrm{\Xi }}_{cc}^{++}$ state

We investigate the weak semileptonic decay of the $ {\mathrm{\Omega }}_{ccb}^{+}\to {\mathrm{\Xi }}_{cc}^{++}\ell {\overline{\nu }}_{\ell }$, where a triply heavy baryon with spin $ 1/2$ decays into the observed doubly heavy baryon with spin $ 1/2$, using quantum chromodynamics (QCD) sum rule method in all lepton channels. We compute the six relevant vector and axial vector form factors entering the low energy matrix elements in full theory. The invariant form factors are building blocks, using the fit faction of which in terms of $ {q}^{2}$ in whole physical region, we calculate the exclusive widths in three lepton channels. Our predictions may help the present and future experiments in the course of their search for doubly and triply heavy baryons.