Search for the doubly heavy baryons and decaying to and *

The first search for the doubly heavy $\it{\Omega}_{bc}^{\rm0}$ baryon and a $\it{\Xi}_{bc}^{\rm0}$ are performed using $pp$ collision data collected via LHCb experiment from 2016 to 2018 at centre-of-mass energy of $13TeV$, corresponding an integrated luminosity 5.2$fb^{-1}$. baryons reconstructed their decays $\it{\Lambda_{c}^{+}\pi^{-}}$ $\it{\Xi_{c}^{+}\pi^{-}}$. No significant excess is found invariant masses between 6700 7300$MeV/c^2$, in rapidity range 2.0 4.5 transverse momentum 2 20$GeV/c$. Upper limits set on ratio production cross-section times branching fraction ($\it{\Xi_{c}^{+}\pi^{-}}$) relative that $\it{\Lambda_b^{\rm0}}$ ($\it{\Xi_b^{\rm0}}$) baryon, different lifetime hypotheses, $95\%$ confidence level. upper $0.5\times10^{-4}$ $2.5\times10^{-4}$ $\it{\Omega}_{bc}^{\rm0}\rightarrow\it{\Lambda_{c}^{+}\pi^{-}}$ ($\it{\Xi}_{bc}^{\rm0}\rightarrow\it{\Lambda_{c}^{+}\pi^{-}}$) decay, $1.4\times10^{-3}$ $6.9\times10^{-3}$ $\it{\Omega}_{bc}^{\rm0}\rightarrow\it{\Xi_{c}^{+}\pi^{-}}$ ($\it{\Xi}_{bc}^{\rm0}\rightarrow\it{\Xi_{c}^{+}\pi^{-}}$) depending considered mass ($\it{\Xi}_{bc}^{\rm0}$) baryon.