Search for the doubly heavy baryons Xibc and Omegabc decaying to Lc-pi and Xic-pi

A search for the doubly heavy baryons Ξ0 bc and Ω 0 bc is performed using pp collision data collected with the LHCb experiment from 2016 to 2018 at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.2 fb−1. The baryons are reconstructed via their decays to Λc π − and Ξ+ c π −. No significant excess is found for invariant masses between 6700 and 7300 MeV/c2, in the rapidity range from 2.0 to 4.5 and the transverse momentum range from 2 to 20 GeV/c. Upper limits are set on the ratio of the Ξ0 bc and Ω 0 bc production cross-section times its branching fraction to Λc π − (Ξ+ c π −) relative to that of the Λb (Ξ 0 b ) 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 Ξ0 bc → Λc π− (Ω0 bc → Λc π−) decay, and from 1.4 × 10−3 to 6.9× 10−3 for the Ξ0 bc → Ξ+ c π− (Ω0 bc → Ξ+ c π−) decay, depending on the considered mass and lifetime of the Ξ0 bc (Ω 0 bc) baryon.