Search for the doubly heavy baryons Ω0bc and Ξ0bc decaying to Λ+cπ− and Ξ+cπ−
The first search for the doubly heavy Ω0bc baryon and a search for Ξ0bc baryon are performed using pp collision data collected via the LHCb experiment from 2016 to 2018 at a centre-of-mass energy of 13TeV, corresponding to an integrated luminosity of 5.2fb−1. The baryons are reconstructed via their decays to Λ+cπ− and Ξ+cπ−. No significant excess is found for invariant masses between 6700 and 7300MeV/c2, in a rapidity range from 2.0 to 4.5 and a transverse momentum range from 2 to 20GeV/c. Upper limits are set on the ratio of the Ω0bc and Ξ0bc production cross-section times the branching fraction to Λ+cπ− (Ξ+cπ−) relative to that of the Λ0b (Ξ0b) baryon, for different lifetime hypotheses, at 95% confidence level. The upper limits range from 0.5×10−4 to 2.5×10−4 for the Ω0bc→Λ+cπ− (Ξ0bc→Λ+cπ−) decay, and from 1.4×10−3 to 6.9×10−3 for the Ω0bc→Ξ+cπ− (Ξ0bc→Ξ+cπ−) decay, depending on the considered mass and lifetime of the Ω0bc (Ξ0bc) baryon.