Studies of charmed baryons at LHCb

We report a search for the doubly charmed baryon ${\mathrm{\Xi }}_{cc}^{+}$ through the decay ${\mathrm{\Xi }}_{cc}^{+}\to {\mathrm{\Lambda }}_c^{+}{K}^{-}{\pi }^{+}$, using a data sample corresponding to an integrated luminosity of $0.65\mathrm{p}{\mathrm{b}}^{-1}$ of $pp$ collisions at $\sqrt{\mathrm{s}}=7\mathrm{T}\mathrm{e}\mathrm{V}$. In the mass range 3300-3800$\mathrm{M}\mathrm{e}\mathrm{V}\mathrm{/}{c}^2$ no significant signal is observed. Upper limits at $95\mathrm{\%}$ confidence level are set on $R$, the ratio of the production cross section of the ${\mathrm{\Xi }}_{cc}^{+}$ times the relevant branching fraction over the ${\mathrm{\Lambda }}_c^{+}$ cross section, as a function of the ${\mathrm{\Xi }}_{cc}^{+}$ mass and lifetime. The largest upper limits on $R$ over the investigated mass range are $R<1.5\times {10}^{-2}$ for a lifetime of $100\mathrm{f}\mathrm{s}$ and $R<3.9\times {10}^{-4}$ for a lifetime of $400\mathrm{f}\mathrm{s}$.