【摘 要】
：
The first search for the doubly heavy Ω0bc baryon and a search for the Ξ0bc baryon are performed using pp collision data collected via the LHCb experiment from 2016 to 2018 at a centre-of-mass energy of 13 TeV,cor-responding to an integrated luminosity of
【机 构】
：
Nikhef National Institute for Subatomic Physics,Amsterdam,Netherlands;Physik-Institut,Universit(a)it
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The first search for the doubly heavy Ω0bc baryon and a search for the Ξ0bc baryon are performed using pp collision data collected via the LHCb experiment from 2016 to 2018 at a centre-of-mass energy of 13 TeV,cor-responding to an integrated luminosity of 5.2 fb-1.The baryons are reconstructed via their decays to ∧+cπ-andΞ+cπ-.No significant excess is found for invariant masses between 6700 and 7300 MeV/c2,in a rapidity range from 2.0 to 4.5 and a transverse momentum range from 2 to 20 MeV/c.Upper limits are set on the ratio of the Ω0bc andΞ0bc production cross-section times the branching fraction to ∧c+π-(Ξc+π-) relative to that of the ∧b0 (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 theΩ0bc→∧+cπ-(Ξ0bc→∧+cπ-) decay,and from 1.4× 10-3 to 6.9× l0-3 for the Ω0bc→Ξ+cπ-(Ξ0bc→Ξ+cπ-) decay,de-pending on the considered mass and lifetime of the Ω0bc (Ξ0bc) baryon.
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